This is a 17x10 R/C Airplane Tractor Wood Propeller by J&Z Products. / / FEATURES: Fine crafted, wooden tractor propeller for R/C aircraft. / True pitch and has been balanced twice before shipping. / Single center bore. / Made of hard rock maple wood. / Clear coated natural wood finish. / Straight-cut tips. / / INCLUDES: (1) Wood Prop / / SPECS: Bore Diameter: 1/4" (6mm) / Prop Diameter: 17" / Prop Pitch: 10" / / REQUIRES: All propellers must be checked and balanced before using. / Depending on the engine crankshaft size, the propeller may need to / be reamed to a larger size using GPMQ5006 (SAE) or / GPMQ5007 (Metric). / kr5/15/03