Wiseco S376 Piston Wrist Pin Fits Wiseco piston part number series: 4171M, 4419M, 4676M, 575M Superfinished outer diameter (for 2 and 4-cycle use) Outer diameter: 18.000mm x length: 62.81mm x inner diameter: 12.00mm Weight: 85 grams High quality alloy pin is compatible with most OEM pistons