Feature: 1. High Strength Aluminum Alloy Material: Our bike crankset is made of aluminum alloy, which is light in weight, stylish in appearance. 2. Precise Machining: Multi stripe fixing method is adopted to ensure the ultimate retention of the chain, prolong the working life and reduce friction and noise. 3. Product Size: BCD is 104 mm/4.09 inches, crank arm length is 170 mm/6.69 inches, 38T narrow wide chainring and 36T to 38T guard plate. 4. Strong Compatibility: 38T 170mm bike crankset is suitable for most mountain bikes and road bikes in the market. 5. Product Package: The bike crankset set includes a crank set, narrow widechainring, guard plate, screw and nut. Specification: Item Type: Bike Crankset Material: Aluminum Alloy Color: As Pictures Shown Weight: Approx. 796g / 28.1oz Crank Arm Length: Approx. 170mm / 6.7in Compatible: Single Disc, Dual Disc, Triple Disc Specifications: BCD 104mm, Inside BCD 64mm. Package List: 2 x Crank4 x Screw4 x Nut1 x Positive and Negative Teeth Chainring1 x Guard Plate