Diamond Core Drill Set, Set of 6 Gauges highly-polished

highly-polished

The tall cylinder features 16 holes approximately 7/32" (5mm) in diameter surrounding one center hole approximately 5/16" (8mm) in diameter

This ring generally can be safely sized up or down two whole ring sizes (size 8 to size 12)

000 service hours

its smaller

Diamond Core Drill Set, Set of 6 Gauges highly-polishedThis set features six drills that are hollow all the way through the shaft to help them drill faster with less clogging. Ideal for reaming beads and drilling smaller holes in stone, glass, metal and ceramic, drills are nickel plated and embedded with 180 grit industrial diamonds. Shank sizes vary with head size. This kit includes six diamond core drills, one of each diameter (OD): 1. 0, 1. 25, 1. 5, 1. 75, 2. 0 and 2. 5mm.