Amazon: glass grinding bit
60 Grit 20Pcs Diamond Burr Set - GOXAWEE Rotary Grinding Burrs Drill Bits Set with 1/8-inch Shank, Diamond-Coated Stone Carving Accessories Bit Universal Fitment for Rotary Tools. 4.5 out of 5 stars. 1,444. $14.98. $14. . 98. $14.23 with Subscribe & Save discount. 5% coupon applied at checkout.