Quality Materials: Made of high quality steel with coating, high strength, antioxidant, color fastness, lightweight and durable. with the chain and the gripping force. Thin handle: it is used to fix the crank and the crank of the chain wheel. Slim design with precise processing, fits the crank perfectly and provides professional crank fixing. Colorful style: suitable height for the bicycle waterproof and functional material very durable lightweight easy to handle colorful style personality.Application: Suitable for mountain bikes, racing bikes, folding bikes, fixed gears, downhill bikes, bicycles, trail bikes, etc. Features: Made of high quality steel with coating, high strength, anti-rust, colorfast, lightweight, durable. Used to fix the bottom bracket and sprocket crank. Slim design with precise machining, fits the crank perfectly and provides professional crank fixing. Narrow and wide teeth increase chain contact area and holding power. Suitable for mountain bikes, racing bikes, folding bikes, fixed gear, downhill, etc. Specification: Material: Steel Size: as the picture show Color: Silver Package Content: 5*Screw+Nut