This is the Drive Washer for the / O.S. Max .25LA, 25LA-S, 20FP and 25FP Engines. / This washer is installed on the crankshaft and provides a positive grip / for the propeller or spinner backplate. / / FEATURES: Replaces damaged drive washers / Aluminum construction / Serrated face to grip the prop or spinner backplate / / INCLUDES: One Drive Washer / / REQUIRES: Installing onto the crankshaft. / / SPECS: Diameter: 0.84" (21.5mm) / Thickness: 0.33" (8.4mm) / JXS 4/11/01 / ir/jl