This product is suitable for retrofitting folding bikes, bicycles, electric bikes. Lightweight, high axial strength and compatibility. Standard precision machining, chain retention, increases service life and reduces friction. A good replacement for bicycle repair and upgrade, compatible with many bicycle models. 170mm crank arm length without overlap of the crank arm and chainring bolt. Specifications: 48TBED double protection x 170MM handle square hole, with 9/16 inch pedal axle, chain guard, Introduction: Compatible with 6/7-speed rear derailleur, installation recommendation: suitable for lithium battery/bicycle type lithium battery/bicycle etc. Color: black Material: aluminum alloy Package contents: 1 x Crankset 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 allowed measurement error is +/- 1-3 cm.