Feature: 1. [High Hardness] High strength aluminum alloy material, fine workmanship, high hardness, and not easy to deform. Rugged and durable, easy to use and operate. 2. [Anodic Oxidation] The appearance is treated with anodic oxidation, with bright color and corrosion resistance. 3. [Fine Craftsmanship] The second glossy treatment and fine craftsmanship make its personality shine. Crank set and crank used to fix the sprocket, essential accessories for bicycles. 4. [Crank Nut] The crank nut is exactness machined to perfectly fit the crank and provide professional fixation. 5. [Use] The plate nail fixing wrench is used to fix the plate nail from one side, and cooperate with the hex wrench to remove the plate nail from the other side. Specification: Item Type: Single Chainring Bolts Material: Aluminum Alloy Wrench for Screw Caliber: 9MM, 10MM. Package List: 5 x Single Chainring Bolts1 x Wrench