THESE BITS ARE THE BEST IN THE WORLD, THEY DO NOT HEAT UP, PRODUCE LESS DUST AND FEEL DIFFERENT, YOUR CLIENTS WILL BE ABLE TO TELL BECAUSE THE BIT DOES NOT RUST OR PRODUCE HEAT MAKING THEIR SERVICE MORE ENJOYABLE. NO SHARP EDGES SO THE CLIENTS WILL NEVER GET CUT OR HURT. THEY LAST MUCH LONGER THAN ANY OTHER MATERIAL AND CAN BE USED ON ANY TYPE OF NAIL SERVICE LIKE GEL, ACRYLIC AND NATURAL NAILS! PINK DIAMONDS DRILL BITS ARE SIZE 3/32