This single speed converter is very suitable for the bicycle that suits for mountainous terrain The floating pulley and spring adjustment can achieve perfect chain tension This bike chain tensioner is and easy to install Made of high-quality aluminum alloy, this bicycle chain tensioner is durable Suitable for people who like cycling This product is made of aluminum alloy material and processed by CNC technology. The product is and has improved strength. The hollow design, exquisite workmanship, anodized, and engraved LOGO can prevent the chain from falling off and reduce the tooth feel. Type:Chain Tensioner Theme:Sports Features:Easy to Use Sports Type:Cycling Colour:black Material:Aluminum alloy Size:90 x 57 x 54MM Package Contents: 1 x Bike Chain Tensioner Only the above package content, other products are not included. Note: Light 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.