Feature: 1. Made of premium aluminum alloy,with nice durability, strong and wear-resistant, not easy to rust. 2. Effectively fix the crank, prolong the lifespan of the crank and improve the riding safety. 3. Easy to install and use, lightweight design, no burden to ride. 4. Nice crank screw repairing accessory, universal for mountain bikes and road bikes. Specification: Features: Made of premium aluminum alloy,with nice durability, strong and wear-resistant, not easy to rust. Effectively fix the crank, prolong the lifespan of the crank and improve the riding safety. Easy to install and use, lightweight design, no burden to ride. Nice crank screw repairing accessory, universal for mountain bikes and road bikes. Specifications: Color: Black Material: Aluminum Alloy Fitment: Type1(for DUB M18/M30) / Type2(for GXP M15/M26)(optional) Item Weight: Type1: 15.6g/ 0.6oz Type2: 11.1g/ 0.4oz Packing Size: 100 * 80 * 50mm/ 3.9 * 3.1 * 2.0in Package Weight: Type1: 20g/ 0.7oz Type2: 16g/ 0.6oz Packing List: 1 * Crank Arm Bolt Kit Package List: 1 * Crank Arm Bolt Kit