This 10 pack of DEWALT cutoff wheels are perfect for cutting metal and stainless steel. They have a wheel diameter of 4-1/2 inches and a thickness of 0.045 inches. The abrasive material used is aluminum oxide, making these wheels durable and long-lasting. The arbor hole size is 7/8 inch, and they are type 1 wheels. This product is brand new and has not been used before.