Features:

【Ultra-light Material】：Made of high strength Aluminum Alloy, Non-slip &Durable,Weight is approx 675g/1.48Ib.
【Professional Design】Ergonomic structure,Super lightweight and incredibly strong.Best choice for riders who want more control on their bicycles.
【Size】BCD: 104mm/4.09in. Crank Arm length: 170mm/6.69in, Crank related holes distance: 74mm/2.91in.Bottom Bracket Width: 68-73mm/2.67-2.87in.
【Easy Installation and compatibility.】 Compatible with most mountain bikes and dirt bicycles.Including not confined to Shimano, FSA, Gaint ATX770 ATX770-D XTC 750.

Specifications:

Crank description:
Crank Arm length: 170mm
Color:Black/Red
Material: AL6061 aluminum alloy
Compatible: Single/Double/Triple chainrings; for 7/8/9/10/11/12S chains
Bolt Center Diameter: 104mm BCD
Weight: about 637g (right & left)

Chainring description:
Type: Single speed
Color: Black,Red
Material: Aluminum alloy 7075-T6
Bolt Center Diameter: 104mm BCD
Teeth: 32/34/36/38/40/42/44/46/48/50/52T Round Chainring
Thickness: 4mm (1.9mm Narrow, 3.7mm Wide)
Compatible with: 7/8/9/10/11/12 speed chains (for Shimano/SRAM/FSA crank)

Bottom Bracket description:
Size: 41*24*24mm( threaded)
Spindle/Bearing inner diameter: 23.79mm
B.B BSA: 68-73mm
Fit BB shell inner diameter: 1.37in x 24 TPI
Spindle Interface Type: Hollowtech II
Chain line: 48.5mm
Bearings: Sealed (3 spacers included)
Hollow axle, one piece external bottom bracket for MTB/Road bike,folding bike refitting
Suit for Shimano, FSA compatible. Giant ATX770 ATX770-D XTC750 and so on