Heavy-duty rubber pad, aluminum core with nickel-plated removable steel shank Compatible with 2-Inch Sanding Disc, Shank diameter: 1/4 inch, Maximum RPM: 30,000 Threaded pad backs screw tightly onto the mandrel, and allow for quick and easy changes. Accepts sanding, polishing, surface conditioning/preparation, bristle and other disc consumables The high quality aluminum and the long-lasting rubber will provide sturdiness and strength Yakamoz 2Pcs 2-Inch Roll Lock Sanding Discs Holder Quick Change Pad Adaptor Feature: Allow attachment of various types of discs, complete everything from prep to polish. Disc Pad Adaptor Pad Holder- Provide firm support when using roll lock and other bristle discs. Quick change system saves time and speeds up your work. The 1/4"(6.35mm) shank makes the unit compatible with power drills, die/air grinders, and many other power tools. Rated 30,000 RPMs, this pad holder is great for sanding, polishing, conditioning/preparation, and much more. Specification: Shank: 1/4 Inch Diameter: 2 Inch Length: 2.36 Inch Screw Hole: M6 Maximum speed: 30000 RPM Package Includes: 2 x Roll Lock Discs Holder