DRILL BUSHESDrill bushes according to DIN 172 and DIN 179. Drill bushing with collar DIN172/ ISO4247 form AStandard: DIN172 Material: Steel, hardened Shop and CAD Drill bushing with collar DIN172/ ISO4247 form BStandard: DIN172 Material: Steel, hardened Shop and CAD Drill bushing cylindrical DIN179/ ISO4247 form AStandard: DIN179 Material: Steel, hardened Shop and CAD Drill bushing cylindrical DIN179/ ISO4247 form BStandard: DIN179 Material: Steel, hardened Shop and CAD