From Amazon
840/1 Impaktor Insert Bit Hex-Plus 6mm x 25mm Carded
Rapid Online
Wera 05073906001 840/1 Impaktor Diamond Bits for Hex-Plus Socket S...
Conrad Electronic
Wera 840/1 IMP DC Impaktor Bits SB SiS Hex bit 6 mm Tool steel alloyed, DLC coated D 6.3 1 pc(s)