50 piece sds plus hammer drill bit assortment in sheet steel case for professionals this comprehensive and well assorted sds plus hammer drill bit selection ranges from 5 to 12 mm the hammer drill bits are made from specially hardened steel with highperformance blades crafted from hard metal and embedded in the bit head hence these can be used even for reinforced concrete the sds plus hammer drill bits are stored in a sturdy sheet steel case ready for use at all times