Diamond Twist Drills - Set of 12 sku: 2261300 High-speed steel twist drills are coated at the tip with a medium-fine diamond grit for drilling stones, ceramics, glass and other hard nonmetallic materials. Use water as a lubricant.12 piece set contains one of each diameter: 0.90mm, 0.99mm, 1.18mm, 1... $88.85 / Set of 12 MSRP: Add to Cart Compare