Aluminum Oxide Buff Wheels These aluminum oxide impregnated abrasive buffs are created with radial blades designed to restore the fine satin finish on watch cases and watch bracelets. Wheel diameter is 100 mm, width is 20 mm with a hole diameter of 6.0 mm. Suggested work speed is 2800 RPM, with a maximum work speed of 5500 RPM. Suitable for use on steel and all precious metals. Available in 3 degrees of finish.