DEWALT Black & Gold HSS Drill Bits have a speed tip and a tough core for increased durability. The bits also incorporate a no-spin shank that eliminates the frustration of the bit spinning in the chuck. Supplied in a TOUGH CASE+, this is part of a connectable case system that is TSTAK™ compatible. Individual TOUGH CASES can be clipped together for easy transportation. This 14 Piece Set contains the following sizes: 1, 1.5(x2), 2(x2), 2.5, 3(x2), 3.5, 4(x2), 5, 6 and 8mm.