Item Type: Shaft Coupling Material: Aluminum Alloy Color: Silver Product Size: Approx. 25x19mm/0.98x0.75in Inner Hole Diameter: Approx. 5mm/0.2in Suitable for The Modification of 40MM/1.57in Diameter Water Pusher1APPLICABLE CALIBER: Shaft coupling absorbs parallelism, angular deviation and shaft end play by spring action for 40mm caliber water pusher modification, it will perfectly meet your requirements. 2STRESS RELIEF: The flexibility of the coupling shaft eliminates the stress between the motor and the drive components. 3HIGH HARDNESS: Flexible couplings have high hardness, excellent response performance, not easy to loosen, unique design, cool personality. 4EASY TO INSTALL: Shaft coupler can be installed without complicated steps, you can do the maintenance and installation by yourself. 5REPLACEMENT: Motor coupling is easy to install and disassemble, you can directly replace the original or damaged parts to get higher strength. 4 x ShaftCoupling