Description: 【Quality Material】: The M12 crankset screw is made from aluminum alloy, ensuring rust resistance, high strength, durability, and lightweight 【Fine Craftsmanship】: This bottom bracket crank screw is finely crafted with a lightweight design for complete fixation. It's great for those who value both functionality and aesthetic in their bike parts 【Easy Installation】: The crank arm bolt serves as a great replacement for your damaged or old parts. It's designed to be easy to install, making it convenient even for non professionals 【Wonderful Accessory】: This screw is used for bicycle chain wheels to fix the crankset group and cranks securely. Its tightening, sealing, and waterproof features make it a wonderful accessory for your bike 【Product Details】: The screw overall dimensions are 24.4 mmx20.53 mm/0.96 inchx0.81 inch and the package includes 1pc screw only Specification: Material: Aluminum Alloy Size Chart: Thread Diameter: 12 mm/ 0.47 inch Thread Length: 16.67 mm / 0.66 inch Package Includes: 1 Bottom Bracket Crank Screw(3 Pack) Note: Please allow slightly errors 1-2cm differences due to manual measurement.