This is a Prop Adapter to Fit Standard Size Propellers onto a 6mm Motor Shaft. This adapter compression fits onto a smooth 6mm shaft. FEATURES: Large shaft size for Brushless (or Brushed) motors with 6mm shafts INCLUDES: One Prop Adapter One Prop Washer One 5/16-20 prop nut REQUIRES: Tightening the prop nut compresses the prop adapter onto the motor shaft. SPECS: Total length: 1.57" (40mm) Diameter of Drive Washer and Prop Washer: 1.1" (28mm) cmc 07/20/04 ir/jxs