Is it feasible to have one drill bit that will work with all those
There is a video at
From 0:48 the video shows a bit being used to drill through various
materials including a brake disc and a tile, and apparently coming with
a 10-year guarantee (though each replacement under warranty costs £5
This seems to be the product:
Are such drills feasible?
Certainly handy if you are drilling through a batten and want to mark
the masonry clearly, but would *you* really use the same drills for
everything? I would have thought that the cutting edge would blunt if
used for serious stone or concrete drilling, especially with impact, and
then not be much good for wood or metal.
What I liked about my set, before one of my youngsters filched them, was
that they would tolerate more abuse when drilling metal than traditional
high speed steel drills.
For those with an interest in the metallurgy see
M2, M35, and M42 are different AISI grades of chrome/moly/vanadium high
speed tool steels. M2 is the default for traditional good quality HSS
drills, it looks as though M42 might be the norm for the "Cobalt" drills.
HIGH SPEED STEEL
M2 high speed steel tool bits are designed for general purpose machining
mild steel, alloys, and tool steels.
They have good heat and abrasion resistant properties and are best used
when making an
interrupted cut or where the tool may be subjected to heavy load or shock.
5% COBALT (M35)
(M35) 5% Cobalt tool bits are designed for heavy duty machining alloy
steels and tough materials, such as
castings and forgings. They have high heat and abrasion resistant
properties and are best used when making heavy cuts, at high speeds and
feeds, or where high heat is a factor.
(M42) 8% Cobalt tool bits are designed for machining work hardening
alloys and other tough materials. They have
increased water resistance and tool life. This improves performance and
retention of the cutting edge.
8% COBALT (M42)
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