Features: SUIT FOR:Compatible for M4050 M590 M610 SLX XT XTR and more.Easy to install and tighten it only if you make sure the thread in alignment. PREMIUM MATERIAL: The crank arms are made of high quality Aluminum alloy , sturdy and durable.High strength, high hardness, not easy to deform.Aluminum alloy construction is corrosion resistant, solid and durable,durable for long time use. PERFECT CUTTING: Standard precision cutting of hole, which ensures perfect fit to bike, easy to install. EXQUISITE WORKMANSHIP: Fine polish and great paint, colorfast and stylish.Center to center Distance: Approx. 170mm / 6.7in Whole Dimensions( L * W): Approx. 22 * 4.5 * 3cm / 8.7 * 1.8 * 1.2in. GREAT ACCESSORY: A nice replacement for bike repair, compatible with many bike models.Wonderful part for replacing the old ones. Specification: Material: Aluminum Alloy Color: Black, Silver(Optional) Compatibility: for M4050 M590 M610 SLX XT XTR and more Center to center Distance: Approx. 170mm / 6.7in Whole Dimensions( L * W): Approx. 22 * 4.5 * 3cm / 8.7 * 1.8 * 1.2in Weight: Approx. 266 - 271g Packing List: 1 x Bike Crank Arm