The 3-cone drill at the NFL Combine, also known as the L-drill, is designed to measure speed, agility, change of direction, body control among other traits. The 3-cone drill, which actually uses four cones in the shape of an L, evaluates how fast a player can change direction while accelerating.
Who can improve draft stock the most: Pass rushers, wide receivers, running backs.
The Rules: Cones are placed five yards apart in the shape of the letter 'L.' The player must sprint to the second cone, turn around sprint back to the first cone and touch it. He then reverses again, sprinting towards the second cone and passing it to reach the third cone. The player runs around the third cone, heading past the outside of the second cone to the first cone. This all must be done in the fastest time possible.
Current NFL Combine record: Cornerback J.T. Thomas, 6.28 seconds (2018)
Here are some current Texans who excelled in the 3-cone drill during their NFL Combine performance:
Justin Reid (2018) – 6.65
Gareon Conley (2017) – 6.68
Chad Hansen (2017) – 6.74
Barkevious Mingo (2013) – 6.84
J.J. Watt (2011) – 6.88
Will Fuller V (2016) – 6.93
Deshaun Watson (2017) – 6.95
The 2020 NFL Scouting Combine takes place Tuesday, February 25 through Sunday, March 1. On-field drills begin on Thursday, February 27 at Lucas Oil Stadium in Indianapolis.
Check out shots of current Texans defensive players from previous NFL Combines. (Photos via AP Images)
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Wisconsin defensive end JJ Watt runs a drill at the NFL football scouting combine in Indianapolis, Monday, Feb. 28, 2011. (AP Photo/Michael Conroy)
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Illinois defensive lineman Whitney Mercilus runs a drill at the NFL football scouting combine in Indianapolis on Monday, Feb. 27, 2012. (AP Photo/Dave Martin)
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Stanford defensive back Justin Reid performs in a drill at the 2018 NFL Scouting Combine on Monday, March 5, 2018, in Indianapolis. (AP Photo/Gregory Payan)
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Wisconsin defensive end JJ Watt runs a drill at the NFL football scouting combine in Indianapolis, Monday, Feb. 28, 2011. (AP Photo/Michael Conroy)
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Vanderbilt linebacker Zach Cunningham runs a drill at the NFL football scouting combine Sunday, March 5, 2017, in Indianapolis. (AP Photo/David J. Phillip)
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Mississippi State linebacker Benardrick Mckinney runs a drill during the 2015 NFL Scouting Combine at Lucas Oil Stadium on Sunday, February 22, 2015 in Indianapolis, IN. (AP Photo/Ben Liebenberg)
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Kentucky defensive back Lonnie Johnson Jr. runs a drill at the NFL football scouting combine in Indianapolis, Monday, March 4, 2019. (AP Photo/Michael Conroy)

Texas defensive lineman Charles Omenihu runs a drill during the NFL football scouting combine, Sunday, March 3, 2019, in Indianapolis. (AP Photo/Darron Cummings)
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Mississippi State linebacker Benardrick Mckinney runs a drill at the NFL football scouting combine in Indianapolis, Sunday, Feb. 22, 2015. (AP Photo/David J. Phillip)
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Illinois defensive lineman Whitney Mercilus runs the 40-yard dash at the NFL football scouting combine in Indianapolis, Monday, Feb. 27, 2012. (AP Photo/Michael Conroy)
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Stanford linebacker Peter Kalambayi runs a drill during the NFL football scouting combine in Indianapolis. (AP Photo/Darron Cummings)
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Ohio State defensive back Gareon Conley makes a catch as he runs a drill at the NFL football scouting combine in Indianapolis, Monday, March 6, 2017. (AP Photo/Michael Conroy)

Wisconsin defensive end JJ Watt runs a drill during the NFL football scouting combine in Indianapolis, Monday, Feb. 28, 2011. (AP Photo/Darron Cummings)

Stanford defensive back Justin Reid runs a drill during the NFL football scouting combine, Monday, March 5, 2018, in Indianapolis. (AP Photo/Darron Cummings)
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Auburn defensive lineman Angelo Blackson runs a drill at the NFL football scouting combine in Indianapolis, Sunday, Feb. 22, 2015. (AP Photo/David J. Phillip)
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Vanderbilt linebacker Zach Cunningham catches a pass during a drill at the NFL football scouting combine Sunday, March 5, 2017, in Indianapolis. (AP Photo/David J. Phillip)

UCLA defensive lineman Eddie Vanderdoes runs a drill at the NFL football scouting combine Sunday, March 5, 2017, in Indianapolis. (AP Photo/David J. Phillip)

Illinois defensive lineman Whitney Mercilus runs a drill at the NFL football scouting combine in Indianapolis, Monday, Feb. 27, 2012. (AP Photo/Michael Conroy)
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Stanford defensive back Justin Reid runs the 40-yard dash during the 2018 NFL Scouting Combine on Monday, March 5, 2018 in Indianapolis. (Ben Liebenberg via AP)

Mississippi State linebacker Benardrick Mckinney runs the 40 yard dash during the 2015 NFL Scouting Combine at Lucas Oil Stadium on Sunday, February 22, 2015 in Indianapolis, IN. (AP Photo/Ben Liebenberg)
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Vanderbilt linebacker Zach Cunningham competes in the vertical jump at the 2017 NFL football scouting combine Sunday, March 5, 2017, in Indianapolis. (AP Photo/Gregory Payan)

Clemson defensive lineman D J Reader runs a drill at the NFL football scouting combine, Sunday, Feb. 28, 2016, in Indianapolis. (AP Photo/L.G. Patterson)
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Ohio State University cornerback Bradley Roby runs up the fields the at the 2014 NFL Scouting Combine at Lucas Oil Stadium in Indianapolis, on February 25, 2014. (AP Photo/Ben Liebenberg)

Louisiana State defensive lineman Barkevious Mingo runs a drill at the NFL football scouting combine in Indianapolis, Monday, Feb. 25, 2013. (AP Photo/Michael Conroy)
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Rice defensive back Phillip Gaines runs a drill at the NFL football scouting combine in Indianapolis, Tuesday, Feb. 25, 2014. (AP Photo/Michael Conroy)