COMMON SHANK SIZE: The 1/8 shank makes these abrasive wheels suitable to be used as sanding wheels for electric drills, cordless drills, die grinders. For best results and longer service life, rotating speed should be maintained below 20,000 RPM. PREMIUM MATERIALS: High quality aluminum oxide coated abrasive cloth provides a solid and durable grinding power combined with high efficiency and long life to give you that premium performance that you need and expect from your tools. METAL WORKING APPLICATIONS: The mounted flap sanding wheels are commonly used in metalworking as a grinding or deburring wheel to clean up welds and cuts in iron, stainless steel and metal alloys. Also used for removing layers of rust and paint on flat metal surfaces WOODWORKING APPLICATIONS: Often used for flap sander wheels in woodworking for the stripping of old layers of paint when during resurfacing projects or sanding and finishing contoured wood surfaces. VARIETY OF WHEEL SIZES: Our 50 Pack Wheel Sander includes 25 pack 1.26" flap wheels and 25 pack 0.79" flap wheels 20 Pcs Flap Wheel Sander Set, 1/8" Shank 80 Grit Flap Wheels for Rotary Tool