The best way to turn your hammer drill into the perfect multifunctional tool drill chuck for holding accessories with round or hexagonal shanks easy and fast to use with existing metal drills bits wood drills and other accessories with round or hexagonal shanks on hammer drills simply insert it into the hammer drill with an sds plus drill chuck and then you can work as per normal cylindrical drill chuck with sds plus holder for round and hexagonal bits mounting capacity 15 13 mm with chu