ITEM NAME:M15 M26 Easy Install Self Extracting Road Bicycle Crank Arm Bolt Repair Tools Features: They're a great for replacing stripped M15/M26 crank arm bolts. Compatibility: For GXP crank all. Installation requires 8mm hex and 16MM hex wrench. Made of aluminum alloy, durable for use. Self extracting crank arm bolt. Specifications: Material: aluminum alloy Color: black Size: M15 crank, M26 cap Package Included: 1 Set x Bolt Note: 1. Due to the light and screen difference, the item's color may be slightly different from the pictures. 2. Please allow 0.5-2 cm differences due to manual measurement..Size: M15 crank, M26 cap. Self extracting crank arm bolt. They're a great for replacing stripped M15/M26 crank arm bolts. Compatibility: For GXP crank all. Installation requires 8mm hex and 16MM hex wrench.