PermaGrit rotaries come with a standard 3mm integral arbor so they can be used with reversible drive tools. They work well with MiniCraft, Dremel, and FlexDrives. Offered in a variety of shapes and sizes at 2 different grit grades. They allow the user to cut, rout, and shape a wide range of materials quickly and cleanly, often without the need for secondary finishing. The range is complemented by cutting discs, available in 2 sizes for cutting the toughtest of materials from piano wire to fiberglass and ceramics to high speed steel.