The AWORKX Axle Blocks are designed to hook onto the chain tension screws, preventing them from falling out of the swingarm. They feature adjustment markings spaced every 3 mm. These axle blocks are a high-quality alternative to the original axle blocks and allow for extremely precise chain tension adjustments. Manufactured from A6061-T6 aluminum through high-precision CNC milling, these axle blocks guarantee durability and accuracy.