I bought a disc "construct wood bosch" designed for boards with nails and concrete residues (it was necessary to saw this) - and it’s true, it saws, it doesn’t notice 100 nails. Its pros: powerful, complete with a normal disk, though only 16 teeth, but it cuts smoothly without scuffing. Not very heavy for that kind of power. Cons: not too light for jewelry work, but it is not intended for this