Specifications:
Cutting Edge Diameter: 0.3mm / 0.012", 0.4mm / 0.039"
Cutting Edge Length: 6mm / 0.24", 5mm / 0.2"
Shank Diameter: 3.175mm / 1/8", 0.4mm / 0.039"
Overall Length: 38mm / 1.5", 20mm / 0.78"
Material: Tungsten Carbide, High Speed Steel
Package Included: 10pcs x 0.3mm Tungsten Carbide Drill Bits, 10pcs x 0.4mm High Speed Steel Drill Bits

Descriptions:Suitable for drilling and engraving PCB, acrylic, plastics, fiberglass, wood, aluminium, soft metals. Fit for PCB drilling machines, engraving machine, CNC and high precision special drilling equipment.
0.3mm tungsten carbide PCB drill bits have high hardness, good toughness, wear resistance, high strength, resistance to bending and heat resistance. Carbide material with good milling and cutting performance, can ensure high work efficiency.
0.4mm high-speed steel drill bits have high hardness, good toughness, high wear resistance, suitable for most general purpose applications.
Sharp cutting edge provides smooth cutting, reduces cutting force and prevents drill broken, improves the drilling accuracy. It has good cutting strength and drilling effect. Spiral chip space design for fast and clean chip removal.
With sharp cutting edge, milling groove and clean surface, these tool sets work quickly and cleanly, no glitches or scrap left. The longer the length of the tool clamped by the chuck, the better.
Large drill bit chip space, chip resistance, chip smooth, small drilling heat. Tips: The drill bits are too tiny, so it is very fragile for handling. Please be careful and take good control of your CNC speed.