ompatible for M4050 M590 M610 SLX XT XTR and more. Aluminum alloy construction is corrosion resistant, solid and durable. Easy to install and tighten it only if you make sure the thread in alignment. Widely applied for various bikes. Wonderful part for replacing the old ones. Specification: Condition: 100% Brand New 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 Notice: Please allow 1-3cm error due to manual measurement and make sure you do not mind before ordering. Please understand that colors may exist chromatic aberration as the different placement of pictures.