What's crammed into the backpacks and tool bags worn by every team member in the pit area? We asked a few top wrenches about what they carry to the track and why while in the pits, with answers ranging from basic wrenches to unusual replacement parts. Patrick Barker, mechanic at AutoTrader/Toyota/Yamaha to Weston Peick, shows us what goes inside his Mechanix Wear tool bag before each race.

Pit Pass | Presented by Leatt