ITEM NAME:1PC Durable Aluminum Crank Arm Fixing Bolt For SHIMANO 590 596 XT XTR Chainwheel 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: 1 Piece Bicycle Crank Arm Fixing Bolt SKU: DMO0001621854028430.For SHIMANO 590 596 XT XTR Chainwheel cranks, replace your plastic screw cover. Crank Arm Fixing Bolt. 1 Piece Bicycle Crank Arm Fixing Bolt. Material: Aluminum alloy.