Specifications:
Square Section Size: 4mm x 4mm / 0.16" x 0.16'" (L*W); 5mm x 5mm / 0.2" x 0.2" (L*W)
Overall Length: 200mm / 7.87"
Material: HSS (High Speed Steel)
Hardness: HRC60~62
Package Included: 2pcs x 4mm x 4mm Lathe Tool Bit, 2pcs x 5mm x 5mm Lathe Tool Bit

Descriptions:High Speed Steel (HSS) is with high hardness, high wear resistance and high heat resistance, also known as high speed tool steel or sharp steel.
Can make excellent and smooth cuts in hard materials, such as mild steel, cast iron, alloy and tool steel. Suitable for milling, turning, parting, engraving, drilling, punching, etc. Widely used on a lathe, a milling machine fly cutter or a metal sharper.
The lathe turning tools are superior finishing tools. Features parallel style cutter, with continuous width of cutting edge throughout length of tool bit.