Knob Kit Only! This hollow aluminum knob is extremely light weight and incredibly comfortable. The knob measure 1.85" (47mm) in diameter and weighs about 2oz. Added Power as Hand Wraps Around the Knob to Eliminate Straight-Arm Cranking Eliminates Finger Fatigue & Blisters Lightweight & Comfortable - Attractive Design *No drilling required if you have an existing, properly sized hole in which to fit the post. Proper hole size is 6mm (.236") Includes two washers and screw.