Product description
3.17/5mm RC Boat Flexible Coupler Coupling 3.17/5-4mm Connectors Motor Shaft Chuck
3.17-4mm, motor shaft hole diameter is 3.17mm, flexible shaft hole diameter is 4mm
5-4mm, motor shaft hole diameter is 5mm, flexible shaft hole diameter is 4mm
Material: Stainless steel
Size: Approx. 30 x 10 x 10mm/ 1.18 x 0.39 x 0.39inch