Every toolbox should have a set of small diameter drill bits. These diamond coated bits will make themselves useful time and time again. Virtually no project or hole is too small for these versatile drill bits. Perfect for hobbyists, jewelers, and anyone else who has precision drilling needs.This 10 piece 1/8" Diamond Drill Bit Set will power through tough jobs and hard surfaces. The diamond coating adds to the strength of the bits and enables the bits to penetrate materials such as glass, marble, tile, stone.