So this is what £15 gets you at a carboot sale.

It drilled a 20mm hole with a worn bit (see the one covered in brick dust?) faster than my Bosch SDS could drill a 13mm hole with a fresh bit so I'm quite happy about how well it works.

The issue I am having is that instead of using straight shanks or SDS shanks the drill has a hexagonal hole in the end of the spindle with holds a sort of adaptor which has a tapered hole in the end.

(Spring wants to ping out hence zip ties)

The other half dozen adaptors either have triangular shanks that don't fit the drill or the hexagon is too small or too short.

Taper shanked bit is labelled Armeg but googling their name now only shows SDS or staight shanked bits.

I can't find much technical information about Torna 765s on the internet (though I see a lot how it is the first electro pneumatic drill). Does anyone here know what thesse tapered bits are called and where I can get new ones?