Compatible with: Chain tensioner for mini bike + axle adjuster replacement for Baja Doodlebug DB30 (Blitz, Dirt Bug, Racer), Hensim Doodlebug DB30 (Blitz, Dirt Bug, Racer), Motovox Mbx10 Mbx11 Predator 79cc 97cc 98cc 100cc 2.5 2.8 3.0hp Note: If you want to install mini bike chain tensioner with axle adjuster on the CT100U CC100X minibike, you need to drill mounting holes in the frame for the rear end of the chain adjuster Great Material: Made of durable rubber and metal material, the surface of the tensioner is smooth, reducing chain wear, and can adjust the tightness and tension of the chain well, to keep the chain running smoothly and keep the chain from falling off while riding Function: Chain tensioner is fixed to the frame by nut screws and axle adjuster. Chain axle adjuster moves the chain tensioner back and forth to adjust the tightness and tension of the chain Color: Black & Silver Material: Rubber+Metal Package Contents: 1 * mini bike chain tensioner, 1 * mini bike chain axle adjuster 1 * 35 chain master link Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.