Dimension:1″ bore hub with 1/4″ keyway. Works for 1″ go kart hub axle.

Mounting Hardware:1/4″ shaft key, bolts, and nuts is included.

Fits for go cart and mini bike.Great for sprocket and brake mounting.

Outer diameter: 4″.Perfect fit for 1 inch diameter axle.Easy to install.0.39inch holes and 0.28inch hole.Center-to-center measurements for bolt pattern please refer to picture.

High quality and durable.Provide 6 months warranty.Simply ask for a refund if you are not satisfied.
This sprocket brake hub works with a wide range off-road powersports machines. 
Package Includes:
1 x Sprocket Hub
4 x Bolts&Nuts
1 x shaft key