With this set from Dewalt, you're well equipped for most home screwing and drilling tasks. The set consists of 100 parts, which come in a handy storage box, so it's easy to keep all the parts in order when not in use.The set contains drill bits for drilling in wood, metal, masonry and plastic, and it includes assorted bits of types: PH,SL, PZ, H, T in lengths of 25 mm and 50 mm. In addition, 7 tops, an undersink and a magnetic bit holder are also included in the set.