Cut-Off Wheels are 3\" diameter x 1/16\" thickness x 3/8\" center hole diameter, packed 5 per card. Abrasive reinforced wheels are ideal for automotive and autobody repair. Cut all ferrous materials with ease - cut through clamps, hangars, sheet metal, angle iron, tubing, castings, mufflers and rusted bolts. Easier and safer to control than a torch, faster and less effort than a hacksaw. Wheels comply with American National Standards Institute Code B7.1 (1968 Rev.) and OSHA. Rated 25,000 RPM maximum speed (Pneumatic cutting tool should have safety guard).