This bike crank set is made of premium aluminium alloy, which is lightweight.This product has a high strength and deformation resistance, durable for long time use. It fits for 170 mm crank arm length without any overlap of crank arm and chain ring bolt. This chain set is an ideal replacement for bike repair, compatible with many bike models. Features: 1. HIGH QUALITY MATERIAL: This bike crank set is made of premium aluminium alloy, which is lightweight, adding no heaviness to bike. 2. LONG TIME SERVICE: This product has a high strength and deformation resistance, durable for long time use. 3. FINE WORKMANSHIP: This bike crank set made of standard precision machining, which ensures ultimate chain retention, increases service life, and reduces friction and noise. 4. FEATURE: This product fits for 170mm crank arm length without any overlap of crank arm and chain ring bolt. 5. IDEAL REPLACEMENT ACCESSORY: This chainset is an ideal replacement for bike repair, compatible with many bike models. Specification: Material: Aluminium Alloy Color Options: Black; Red; Blue; Gold BCD: 104 mm Arm Length: 170 mm compatible with: Single Speed Only Weight: Approx. 730 g Package Included: 1 * Crankset 4 * Bolts 1 * Bottom Bracket Cover (Bottom Bracket Not Included)