On 4 Nov, 07:55, "Dave Liquorice"
wrote:

Nothing is unbeatable when it comes down to it. Kevlar threads held
in a nonsetting gunk sandwiched between the skins would give an angle
grinder something to think about though.

Diamond disk goes straight through, as it's not as clog-prone as grit
disks were. Nor is aramid (Kevlar) anything particularly magic.

A tougher bar for angle grinder resistance is scaff pipe filled with
concrete, where the aggregate is particularly hard. The traditional
material from safe manufacture was to use old tungsten carbide lathe
tooling inserts.