Features1Made of aluminum alloy,with nice durability, strong and wear-resistant, not easy to rust. 2Effectively fix the crank, prolong the lifespan of the crank and improve the riding safety. 3Easy to install and use, lightweight design, no burden to ride. 4Nice crank screw repairing accessory, universal for mountain bikes and road bikes.SpecificationFeatures:Made of 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: BlackMaterial: Aluminum AlloyFitment: Type1(for DUB M18/M30) / Type2(for GXP M15/M26)(optional)Item Weight: Type1: 15.6g/ 0.6oz Type2: 11.1g/ 0.4ozPacking Size: 100 * 80 * 50mm/ 3.9 * 3.1 * 2.0inPackage Weight: Type1: 20g/ 0.7oz Type2: 16g/ 0.6ozPacking List:1 * Crank Arm Bolt KitPackage List1 * Crank Arm Bolt Kit