Dremel 5-Pack 1-1/2" Plastic Cut-Off Wheels are designed for cutting plastic. They are compatible with all Dremel rotary tools and the EZ Lock mandrel model EZ402. The wheels have a medium grit grade and a fiberglass backing material. They are 1-1/2" in diameter and 0.045" thick. The wheels have a speed rating of 30 rpm. The DREMEL EZ LockTM makes accessory changes easy as pull - twist - release. The one-piece mandrel design simplifies the process of changing cutting wheels and makes it easy to cut through plastic.