Check the listing for details. 2.15mm Carbide Micro Drill Bits Circuit Boards FR4 CNC PCB Dremel Modeling. Condition: Used. Listed at 12.95 USD. Machinist Machining Quality Tiny Drill Bits For Watch Clock Repair Toy Making Model Cars Trains Trucks Boats Miniature Modeling Jewelry making CNC Circuit board production Hobbies Woodworking Soft Metals Arts and Crafts Installation more... **Bits may or may not come with bumpers. You can message us to request a set with or without bumpers. All bits are 1/8" 3.175mm shank Many Uses: Toy making Model Cars, trains, trucks, boats Jewelry making CNC Circuit board production Hobbies Woodworking Soft Metals Arts and crafts Installation more.............. These micro drill bits are of the highest quality. They are made in Japan and used in South Korea by the Samsung company. They can be used for many things. They are great for making precision holes for those in the arts and crafts field or those who just dabble. The most common use is for making jewelry. Bits from China will get the job done, but the precision quality and durability of these bits will far out perform Chinese made bits!