The US PRO Blacksmiths Drill Bit Set features large diameter HSS drill bits, perfect for heavy-duty drilling tasks. With a reduced shank size, these bits are compatible with standard drill chucks, making them versatile and user-friendly. Key Features: Sizes Included: 14mm, 15mm, 16mm, 18mm, 22mm, 25mm Material: High-Speed Steel (HSS-G Xtra) for durability and precision Shank Size: 1/2" (12.7mm) for compatibility with standard drill chucks Drill Bit Length: 152mm; Working Length: 76mm Design: Milled flutes and 118 point for extended service life Applications: Suitable for steel, cast iron, iron, sheet metal, and non-ferrous metals Finish: Black for improved visibility and durability