This is the Piston Pin Retainers for the OS Max .40-.46 VF, .40-.46 VR, .40-.46 SF and .40-.46 FX series engines. FEATURES: Metal Construction Dark Gray in color INCLUDES: Two Piston Pin Retainers REQUIRES: None, item is a stock part SPECS: Static Inner Diameter: 5.3mm (.21") Static Outer Diameter: 6.1mm (.24") Thickness: .8mm (.030") COMMENTS: These retainers have the familliar "G" shape. NNA 3/17/02 ir/kh