Brass Coupling Wrench 2/2.3/3/3.17mm 20mm 2pcs/set Boat Brass Coupling

Descriptions: *100% brand new and high quality. *The brass coupling is a through hole connecting two optical axes of different diameters or connecting motors and an optical axle or connecting axes of different diameters. *It can be used as either a screw rod or a transmission between the propeller shaft and the motor of a model remote control ship. *Side screw holes are unified as M3. Each coupling is supplied with four screws. *There are many kinds of joint couplers on sold. For example 2mm to 5mm means the apertures diameter at both ends were 2MM and 5MM respectively. Please choose the correct sizes to purchase. Specifications: *Material: brass *Diameter of both ends of cross section: 9mm *Intermediate diameter of cross section: 7mm *Total length: approx.20mm *Optional sizes: 2mm to 2mm 2mm to 2.3mm 2mm to 3mm 2mm to 3.17mm 2mm to 4mm 2mm to 5mm 2mm to 6mm 2.3mm to 2.3mm 2.3mm to 3mm 2.3mm to 4mm 3mm to 3mm 3mm to 3.17mm 3mm to 4mm 3mm to 5mm 3mm to 6mm 3.17mm to 3.17mm 3.17mm to 4mm 3.17mm to 5mm 4mm to 4mm 4mm to 5mm 4mm to 6mm 5mm to 5mm 5mm to 6mm 6mm to 6mm Package Contents: 2x brass coupling 8x screws 2 x wrench