100 Piece Grinding Stone Assortment Pre Mounted On 1/8 Inch Shanks A Complete Variety Of Sizes And Shapes In Gray And Pink Colors All Of The Grinding Stones In This Set Are Pre-mounted On 1/8 Inch Shanks These Grinding Stones Are Compatible For Use With Most Styles Of Rotary Tools The Shapes Include Round, Flat-topped, Bullet, Cylinder, Cone And Many More Excellent Way To Do The Finishing Work On Your Metal Art Or Jewelry Project