Pro Football Focus has been running a series of three-year efficiency ratings for a variety of positions and circumstances. One of PFF's most recent studies was a look at offensive tackle pass-blocking effiency.

It will come as no surprise to New York Giants fans that PFF rates David Diehl of the Giants as the least efficient pass-blocking tackle in the NFL over the past three seasons. PFF divided total pressures (sacks, hits, hurries) allowed and divided that by snaps played at tackle. Diehl came up with an NFL-worst plass-blocking efficiency rating of 92.30.

Showing a sense of humor, PFF wrote that the Giants' tackle has an "impressive ability to give up pressure." That, I am sure Giants' fans already knew.

Here, though, is something you might not have known. Sean Locklear, signed by the Giants as a free agent to provide veteran depth at both tackle spots, is ranked 11th-best in pass-blocking efficiency the past three seasons with a 95.51 rating.

Locklear, if you are wondering, has spent most of his eight-year career playing on the right side -- where Diehl is the starter for the upcoming season.