Feature:1. Made of high quality aluminium alloy material, durable and easy to use.2. Fine workmanship with polishing process, high end practical hollow type.3. Lightweight, stylish and gorgeous styling, high axial strength and compatibility.4. Hollow single tooth disc shaft, suitable for mountain bike, road bike, folding bike modification.5. 170mm crank arm length, no overlap between crank arm and chain bolts.Specification:Condition: 100 percent Brand NewItem Type: Bicycle Integrated Hollow CrankMaterial: Aluminium AlloyOptional Color: Black, SilverSuitable for: Folding BikeQuantity: Left and Right Crank and Middle Shaft and 5PCS Screw and 5PCS Single Plate ScrewWeight: Approx. 795gLength: Approx. 170mm or 6.69inchBCD: Approx. 130mm or 5.12inch.Package List:1 x Left and Right Crank 1 x Middle Shaft 5 x Screw 5 x Single Plate Screw1 x AccessoriesNote:1. Please make sure the BCD of the tooth plate is 130MM2. BCD is a circle with five holes in the crank3. The diameter of this circle is the distance from the crank hole to the center of the crank is 65MM(notice the distance in the plane on the side of the tooth disk)