Feature: Crank arm: length: 170mm, specification: BCD 104, compatible: single/double/triple chain plate; used for 7/8/9/10/11S sprocket Bottom bracket: suitable for BSA: 68--73mm Advantages: light weight, stylish appearance, very cool, high axle strength, strong compatibility. Can reduce the weight of the bike and make it look cooler Made of high-strength aluminum alloy, non-slip and durable, weight is about 675g / 1.48Ib. Suitable for Shimano, compatible with FSA, Giant ATX770 ATX770-D XTC750 Specification: Name: Four-arm integrated crank set Crank: about 170mm Material: aluminum alloy Compatible: single disc, double disc, three disc, 9S 10S crankshaft Specification: BCD 104.104mm Related hole distance: about 74mm Diameter of bottom support: about 23.79mm Weight: about 710g crank set, plus BB 820g Color: black, red, silver Name: Bearing Center Shaft Type: Hollow shaft Hollow integrated crankshaft, suitable for mountain bikes. The width of the bottom bracket of road bikes is 68-73mm. Package Included: 1x Left and right crank or 1*left and right crank + bottom bracket 1x BB cap 1x Installation tool 4x Sets of double lock plate nails 4x Straight nail