This Jobber Drill Set contains 12 drill bits, ranging from 1.0mm to 6.5mm in 0.5mm increments. The drill bits are high speed steel (HSS) and come in a trade heavy duty case to keep them clean and together in one spot.
A bright finish tool has no surface
treatment and is supplied in the
as-ground condition. These tools are
suitable for general purpose use,
particularly for non-ferrous applications.
High Speed Steel (HSS)
Bordo HSS jobber drills are ground from premium quality M2 high speed steel. HSS can withstand higher operating temperatures than carbon steel without losing its temper (hardness). This property allows HSS to cut faster than high carbon steel, hence the name high speed steel.
M2 HSS is an alloyed steel in the tungstenmolybdenum series which typically contains 4% Chromium, 5% Molybdenum, 6% Tungsten, 2% Vanadium and 1% Carbon (approx. by % wt).
The material is also subject to high temperature heat treatment to complete the process. HSS steel has a very high wear resistance, a bending strength up to 4700MPa with high toughness and themoplasticity.
HSS jobber drills are ideal for general purpose use in a wide variety of ferrous and non-ferrous metals, timber and plastic.