Essential for bolts with tight clearance: spark plugs and header bolts! 12-point for maximum finger traction. Set of three including 1/4 x 1/4, 1/4 x 3/8, 3/8 x 3/8 (12 pt x socket size). Belongs in every tool box!Pit Stop USA offers Proform Socket Assist Kit - 12 Pt 67575 at low everyday prices. Be sure to check out all of our products from ProForm including ProForm Socket Assist Tools and ProForm Spark Plug Sockets.