AeroConversions Spinner/Crush Plate machined from solid 6061-T6 aluminum billet doubles as Crush Plate and Spinner. Great for higher RPM engines that tend to shed traditional sheet metal or fiberglass spinners. Fits AeroVee, Jabiru 2200, Rotax and UL Power (standard flange) Prop Hub Bolt Pattern with 5/16" dia. bolt holes. Also availalable to fit SAE-1 prop hub bolt pattern with 3/8" dia. bolt holes, used on Jabiru 3300 and many other engines. New hollow-center spinners are approximately half the weight of earlier AeroConversions spinners. Weights: AeroVee/2200/Rotax/UL Power (standard flange) - 1lb, 4.5oz; SAE-1 (3300) - 1lb, 14oz.