Halls MC High Speed Steel Step Drill Bit – HLLMC7M

The Halls MC High-Speed Steel Step Drill Bit in the 4mm - 20mm size range offers excellent coverage of the most commonly used hole sizes for everyday trade work. This variant features nine sizes—4, 6, 8, 10, 12, 14, 16, 18, and 20mm—in convenient 2mm increments, making it a practical choice for general metalwork, electrical installations, and mechanical fitting. The 10mm shank provides secure chuck retention whilst allowing use in standard drill sizes, offering a good balance between stability and versatility. This step drill is particularly popular with electricians and maintenance engineers who need quick access to frequently used hole sizes without carrying multiple bits. Suitable for sheet metal up to 4mm thick, this variant delivers clean, accurate holes across its range. The 2mm increments cover the majority of common cable gland, switch, and component mounting requirements. Always use a suitable coolant when drilling metals to ensure optimal cutting performance and tool longevity. Features and Benefits: • Nine common sizes from 4mm to 20mm • 10mm shank for secure, stable operation • Maximum material thickness: 4mm sheet metal • 2mm increments cover most standard requirements • Versatile choice for general trade applications Specifications: Min. Size (mm): 4 Max. Size (mm): 20 No. Steps: 9