A&M Instruments Industrial Diamond Bur 0.374" InvertedCone (Dremel 7117) - HP6812-095C – A & M Instruments Quality Diamond Tools
D102 Flat End Taper Diamond Hole Drill – DiamondCore Tools
Diamond Rotary File 1/8" 20 Piece Set
Dremel Diamond Grit 5/64-in Multipurpose Bit Accessory in the Rotary Tool Bits & Wheels department at Lowes.com
20pcs Diamond Drill Grinding Bit Set, Stone Carving Rotary Tools With 1/8-inch Shank For Stone Glass Ceramics Sanding Polishing - Abrasive Tools - AliExpress