Draper expert schroder sds plus shank magnetic bit holder draper expert 33811 b i expert quality i b sds chrome vanadium shank with female 1 4 adaptor magnetic bit holder made from stainless steel for 6 35mm 1 4 hexagon insert bits in accordance with iso1173 packed in polybag draper expert 33811 schroder sds plus shank magnetic bit holder