Universal Replacement Pad: The 5" shackle replacement pad has 4 screw holes and 8 dust holes, fits most sander back pads, the pad's screw holes measure approximately 1.5" center to bottom center to bottom. For 4-Auger Sanders: Fits Milwaukee Random Orbital Sanders 51-36-7090, 51-36-7100, 6021 -21, 6034-21 and Ridgid R2600 and R2601; 5 inches in diameter, 8 dustproof holes and 4 screw holes. especially the center-to-center screw holes (1- 1/4 inch) PREMIUM MATERIALS: These disc sanding pads are made of rubber, with smooth surface, not easy to break, can be used multiple times times for a long time and work well on sanding flat surfaces EASY ASSEMBLY: Built-in mounting threads allow you to easily and quickly install the sander replacement pad, allowing you to 'save time and effort to replace Extend the life of your sander: you will get 2 x 8-hole sander shackle pads in the package, enough for your personal use and replacement . Pad replacement is available for pads with a 1-1/4" center-to-center distance between pad screw holes. Sprinkle: Sanding disc for use with sanders, with 8 holes to suck dust and debris into the e dust bag. Specification: Material: Rubber Size: 5 inches in diameter