Specification: Mub-skipper 18-22HP Twister Ergonomic Center Mounted" z" style Stainless steel 2 blade propeller or 3 blade propeller 9.5". Multi setting trim adjustment Brake handle style throttle lever Alumium Throttle Lever stainless steel throttle cable Sealed roller bearings throughout assembly Lockable transom Mount Ergonomic tiller handle Vented skeg Multiple grease points Spline connector for longshaft and propeller : Strong metal to metal contact and positive resistance to vibration and looseing; Easy to assemble and unassemble.