Description 5/8 Inch Aluminum Key Hub 18084 Designed to connect a motor and a wheel Material: Aluminum-alloy Inside diameter: 5/8 inch Outside diameter: 56.8 mm Bore Length: 26.4 mm The 5/8 Inch Aluminum Key Hub 18084 is designed to connect a motor and a wheel. There is a groove of key locked for securing a motor to the hub. View more What's Included 1x 5/8 Inch Aluminum Key Hub 18084 Dimensions Size Inside Diameter: 5/8 inch Outside Diameter: 56.8 mm Bore Length: 26.4 mm Specifications Material: Aluminum-alloy Weight: 62.5g