ITEM NAME:2Pcs Durable Bicycle Fixing Chainwheel Crankset Arm Bolts M20 For XT Description: Crank Arm Fixing Bolt Colorful bike bicycle parts accessory Made of precision aluminum alloy, lightweight and completed fixed, CNC machined parts with the same genuine engagement For SHIMANO 590 596 XT XTR Chainwheel cranks, replace your plastic screw cover Please using 3/8" (10mm) allen wrench to install Specification: Material: Aluminum alloy Cover diameter: about 28mm / 1.1 inch Thread Height: about 8mm / 0.3 inch Thread Diameter: about 20mm / 0.8 inch Package Includes: 2 Piece Bicycle Crank Arm Fixing Bolt Note: Color might be slightly different due to the color calibration of each individual monitor. Please allow slightly measuring deviation due to manual measurement. SKU: DMO0018758119509518.For SHIMANO 590 596 XT XTR Chainwheel cranks, replace your plastic screw cover. 2 Piece Bicycle Crank Arm Fixing Bolt. Colorful bike bicycle parts accessory. Crank Arm Fixing Bolt. SKU: DMO0018758119509518.