Without any contact, the majority of the position drills do very little to improve or reduce current draft projections. The NFL uses the combine to corroborate or trigger further evaluation for players. In my opinion, the most important part of the process (for the OL) is the interview, medical, and physical measurements. I've compiled the list of arm length measurements from the 2013 draft to help guide your evaluation of OL in this year's combine.
Offensive Tackles
These are compiled arm length results for OT taken in the 2013 draft. You can see in this limited sample that the Offensive Tackle drafted in round 1-3 have a 34"+ arm length, on average.
2013
AVG
MIN
MAX
1st Round
OT
34.6
32
36.75
2nd & 3rd Round
OT
34
34
34
4th & 5th Round
OT
33.77
33.375
34
6th & 7th Round
OT
33.5
32.625
34.375
Offensive Guards
The Offensive Guards have shorter arm lengths than the Tackles, but arm lengths are still very important. When the talent decreases below the 3rd round, NFL teams default to guards with longer arms.
2013
AVG
MIN
MAX
1st Round
OG
33.7
33
34.75
2nd & 3rd Round
OG
33.4
32.75
34.125
4th & 5th Round
OG
34.33
34
34.875
6th & 7th Round
OG
34
32.25
35.5
Center
The Center position clearly has less to do with arm length than it has to do with athleticism.
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