This is the Drive Shaft with Coupler for the AquaCraft Hammer EP model boat. FEATURES: Shaft is constructed of steel with brass coupler INCLUDES: One Drive Shaft and Coupler Two 3x3mm set screws SPECS: Prop Shaft: Diameter- 3mm Length- 185mm Coupler: Diameter- 30.55mm Length- 9.60mm REQUIRES: Connecting to motor shaft and propeller jxs 08/30/05 ir/jxs updated jpg 7/20/07