Operation Machine Machine: 5/8" arbor angle grinder. Recommended RPM: 6000. Maximum RPM: 11000.If you want to install it on a hand drill, in addition to buy a adapter,please ensure that the product is used at the highest speed with the hand drill. Because the general drilling speed of the hand drill is 2000-5000RPM. The drilling speed should not be much lower than the recommended drilling speed.Be careful not to use the hammer or impact mode. Drilling Ideal for drilling the faucet mounting holes in stone countertops, plumbing lines in showers and vanities.For granite marble all nature stone concrete. Wet use is better.Not recommended drilling solid concrete and reinforced concrete. If you have to drill, please add enough water to use. Effect Dry or wet use.If you want to drill more holes, we suggest you keep the bit cool or wet.If you find it hard to drill, please take a break and check the segments. If the segment become blunt, please try to sharp it by drilling a hole on the abrasive concrete and then continue to drill the hard material. Recommend wet use Operation tips : Do not use these drill bits with impact or hammer mode！Fix it on the angle grinder tightly and rightly.Turn on the angle grinder and let the core bits rotating in the air to check if there is a balance problem. Everything is ready and you can follow the below instructions: 1) Place the drill at a 45-degree angle, it will help position.2) Hold the machine very steadily and give gentle pressure to start drilling. Please don't exert too much pressure.3) When you feel that the drill bit has cut into the material( that is, one edge of the hole is about to form), bring the drill up into an upright position slowly( that is to say, return the drill bit to 90°).4) And then keep drilling vertically until the hole has been completely formed.5) In addition to not give too much pressure. Please don’t greatly sway the core bits when working, or the hole will not be round. Slight sway is no problem.6) If you find it hard to drill, please take a break and check the segments. If the segment becomes blunt, please try to sharp it by drilling a hole on the abrasive concrete and then continue to drill the hard material. For hard-to-drill stones, add enough water to use. Feature 5/8"-11 Thread Suitabe for 5/8" arbor angle grinder. Recommended RPM: 6000. Maximum RPM:1000 is the Please don't use hammer mode impact if you use sds or hex adapters to install the 5/8" -11 thread drill bits on hand drill. Laser Weld Turbo Segement Laser welded technology avoid segments off when dry working.Turbo segments provide aggressive drilling speed. Vacuum Brazed Side Protection offers clean cut & steel core protection (inside and outside both). Durable Body Super grade and special bond matrix extends drilling life and improve the working efficiency. diamond drill bits diamond drill bits diamond drill bits diamond drill bits diamond chamfer bit diamond finger bit Add to Cart Add to Cart Add to Cart Add to Cart Add to Cart Add to Cart Customer Reviews 4.0 out of 5 stars 12 4.6 out of 5 stars 3 4.6 out of 5 stars 56 4.6 out of 5 stars 181 4.6 out of 5 stars 966 4.5 out of 5 stars 754 Price $9.99$9.99 $29.64$29.64 $22.99$22.99 $19.90$19.90 $19.99$19.99 $22.99$22.99 Drillng holes ✓ ✓ ✓ ✓ X X Clean Holes X X X X ✓ ✓ Recommend Material Tile Marble Granite Concrete Tile Marble Tile Marble Tile Marble Tile Marble diamond finger bit chamfer bit diamond chamfer bit finger bit diamond chamfer bit finger bit diamond chamfer bit diamond chamfer bit diamond chamfer bit Add to Cart Add to Cart Add to Cart Add to Cart Add to Cart Add to Cart Customer Reviews 4.5 out of 5 stars 754 4.7 out of 5 stars 4 4.7 out of 5 stars 4 4.6 out of 5 stars 966 4.6 out of 5 stars 966 4.6 out of 5 stars 966 Price $18.90$18.90 $27.90$27.90 $29.90$29.90 $23.99$23.99 $26.99$26.99 $13.99$13.99 Size 6-25mm 35mm 50mm 50mm 50mm 20mm