RUKO Step Drill Bit Set, 3 Piece, 4-30mm, HSS

The RUKO Step Drill Bit Set is an essential toolkit for professionals and DIY enthusiasts needing to drill precise, clean holes in thin sheet metal. Comprising three high-speed steel (HSS) bits, this set offers a versatile range from 4mm to 30mm, eliminating the need for multiple individual drill bits. Each bit is engineered with a deep-ground, spiral cutting groove that ensures absolutely smooth running and delivers high cutting performance. This advanced design allows swarf that does not break off to be carried away cleanly, much like a standard spiral drill, which significantly reduces the formation of cutting build-up and prevents cold welding on the cutting edges. The conical shape of the bits makes pulling back from drilled-through metal sheets easier and more efficient.

Crafted from durable HSS with a CBN ground finish, these drill bits are built for longevity and consistent results. The set is specifically designed for working with metal sheets up to 2mm thick, making it ideal for a variety of fabrication, automotive, and repair tasks. Packaged in a convenient mini-box, the set includes sizes 0/9 (4-12mm), size 1 (4-20mm), and size 2 (4-30mm), providing a comprehensive solution for expanding hole sizes without changing tools.

Key Features & Benefits:

• Versatile Range: Covers hole diameters from 4mm to 30mm across three bits.
• High-Performance Design: Spiral cutting groove for smooth operation and efficient swarf removal.
• Durable Construction: Made from high-speed steel (HSS) with a CBN ground finish for extended life.
• Clean Cuts: Reduces cutting build-up and cold welding for a better finish.
• Easy to Use: Conical design facilitates easy retraction from thin sheet metal.
• Compact Storage: Supplied in a practical mini-box for organisation and portability.