8pc Diamond-Cut Off Wheel Set Lapidary Tool fits Dremel This is a new set of 8 diamond coated cutting wheels and 2 mandrels Longevity is assured as the diamond particles are electroplated onto the surface of the metal Each wheel has diamond electroplated onto both sides These are used for cutting, grinding, etc These wheels will fit perfectly onto a standard 3/32" (2.5 mm) mandrel