These Tiny Rubber Wheels Come In A Package Of 24 Pieces. They Are 3/4" In Diameter, And Will Fit A 1/8" Shank, Which Can Be Purchased Separately. These Wheels Are Compatible For Use With Any Rotary Tool. Great For Jewelers And Crafters.* Diamond Reinforced * Fits 1/8" Shank (not Incl) * Fits 1/8" Shank (not Incl) * Compatible With Rotary Tool * Premium Quality