Description: Quality of Alloy Tungsten Steel, high hardness, high strength, durable. Positioning ring design, reduce machine debugging time, improve work efficiency. The aseismic design of the cutting edge can restrain the flutter of the machining process and improve the quality of the machining surface. Sharp cutting edge and large spiral Angle design. Usage: stainless steel, copper, amber wax, plastic, sculpture, mold etc. processing Specification: Shank 3.175mm / 1/8''; Total Length: ±38mm/1.5'' Color of the positioning ring is RANDOM. Package Includes: 10 x PCB Drill Bits