Metal Majority of plastics Wood SMT Fiberglass Carbon FR-4 CEM-3 board and environmental board Also wood alluminum for pocketing, cutouts, groove-making Machinist Machining Quality Tiny Drill Bits For Toy Making Model Cars Trains Trucks Boats Miniature Modeling Jewelry making CNC Circuit board production Hobbies Woodworking Soft Metals Arts and Crafts Installation more...

These Carbide Mircro Drill Bits are from the Union Company in Japan.  We aquired them through our distributer in South Korea where our business was based. 

They have many uses:

Toy Making
Model Cars, Trains and Boats
Jewelry Making
Circuit Board Production
Hobbies
Many more.....

This sale is a 10 piece set.  Sizes are as follows:  All 3.175mm 1/8" Shank

(2 qty) .60mm 
(2 qty) .70mm
(2 qty) .80mm
(2 qty) .90mm
(2 qty) 1.0mm