8 Piece 13mm (1/2″) HSS (high speed steel) blacksmith’s drill bit set

DURABLE: These 13mm (1/2″) shank HSS drill bits are heat-treated and titanium nitride-coated for improved cutting. HANDY STORAGE CASE: They are supplied in a durable storage case for easy transportation. SIZES: 14mm, 16mm, 18mm, 19mm, 21mm, 22mm, 24mm and 25mm.