Shaft converting adapter for HILTI core drill machine DD 200. This adapter replaces the original chuck of DD 200 core drill machine and helps using UNC1-1/4" Shank core drill bits. Replacing the chuck is quite simple and easy. European standard core drill bits comes with UNC1-1/4" Shank which needs additional connection ends to be used by HILTI DD 200. Hence this adapter makes the shaft of the DD 200 machine absolute compatible for all European and other local core bits.