Ultra-hard and long-lasting titanium-coated high speed steel. Precision ground. Suitable for most metals, plastic and wood. Sizes: 1-10mm in 0.5mm increments. Supplied in strong metal case. Ultra-hard and long-lasting titanium-coated high speed steel. Precision ground. Suitable for most metals, plastic and wood. Sizes: 1-10mm in 0.5mm increments. Supplied in strong metal case.