Description: Steel construction, high strength. Suitable for square hole crankset & bottom bracket. Install with M8 allen wrench. Designed to fit most standard arm bolt, including all current road and mountain crank sets Suitable for most of bike. Specification: Material: Steel Length: 17mm / 0.67inch Diameter: 8mm / 0.31inch Package Includes: 20 Pieces Bike Crank Bolts
