This is a 17x10 Pattern Prop from APC. FEATURES: Constructed of Gray composite plastic INCLUDES: One 17x10 APC composite pattern propeller REQUIRES: Installation onto engine SPECS: Length: 17" (432mm) Pitch: 10 COMMENTS: For ¼" crankshaft use 9/32" x 5/16" tubing to make bushing 6-5-03 rjm ir/jxs