JOES Micro Sprint Nylon Chain Block Guide is manufactured with a lightweight and strong aluminum bracket. We use tough high quality Nylon that outlasts other brands. Anodize completes the part and all hardware is included. JOES sets the bar when it comes to quality and this bolt on piece is ready to go right out of the package. You only need one wrench to loosen the bolts because they are positioned so you can do he work with the LR Tire in place allowing you to make adjustments with the car on the ground for efficient settings. Other designs need to be adjusted with the car in the air and often need to be re-set once the car is put on the ground. JOES makes it easy to make quick adjustments. The Nylon block splits in half so you can feed the chain around the sprocket eliminating the need to break links apart.Pit Stop USA offers JOES Micro Sprint Nylon Chain Block Guide System 25869 at low everyday prices. Be sure to check out all of our products from JOES Racing Products including JOES Racing Products Mini Sprint Chain Guides.