I drill my pin holes and lanyard hole and then drill some larger holes in the tang and put a fuller in the tang as well if it's over 3/32" stock. You can drill a heat treated blade, but you need carbide bits to do it. I do a 1/8 or 3/16" hole and then open it up with spade bits for drilling glass or natural stone bits with the carbide tip to them. The 4 fluted spade bits work pretty well!