3 SUPPORTING BASE ADAPTER: The purple one works for bushings with inner diameter 12mm; and red one for bushings with inner diameter 12.7mm; the light blue one for DU bushings. USE: This is used to install or remove the rear shock eyelet bushing and is ideal for rear shock repair and maintenance. MATERIAL: This Bike Rear Shock Bushing Tool is made of high quality material, rust-proof and strong, and can give you a good experience. SIMPLE TO USE: The bushing shock tool is simple and convenient to use, will not damage the rear shock absorber, and is worthy of the choice of bicycle enthusiasts and bicycle owners. GUARANTEE: If you are not satisfied with our product you received, you can send emails to us at any time. We will reply you instantly and help you solve your problem.