Drill bit set DeWalt DT70756-QZ 35 pcs, HSS-G metal drill bits, length up to 290 mm

DeWalt DT70756-QZ is a 35-piece HSS-G metal drill bit set designed for machining and maintenance tasks where reliable, long-reach drilling is required. The set includes bits in a range of diameters, with lengths up to 290 mm to enable deep hole drilling in ferrous materials. Bits are made from ground high-speed steel with a gold ferrous oxide finish to reduce overheating and extend tool life. The kit is supplied in a modular, stackable medium tough case with a clear lid and an inner dovetail system for organized storage and transport.

Advantages

The HSS-G construction and strong central core with a tapered web reduce breakage and provide improved wear resistance for metal drilling. No-walk tips and recessed cutting wings help start holes accurately and produce cleaner, burr-minimised results. An anti-slip shank on larger diameters prevents slipping in the chuck, while the gold ferrous oxide coating reduces heat buildup for longer service life. The case design with clear lid and quick bit retention makes bit selection and storage straightforward.

Suitable for

• Drilling through steel and other ferrous metals for fabrication and repair
• Deep hole drilling where bit lengths up to 290 mm are required
• Maintenance tasks in workshops, construction sites, and vehicle repair

When it may not be suitable

This set is optimised for metalworking; it is not intended for masonry, tile, or wood-specific applications where specialty bits (masonry or wood drills) would perform better. For stainless steel or other very hard alloys, slower speeds and appropriate coolant are recommended; extreme hardness may still require carbide or cobalt-grade bits rather than standard HSS-G.

Key specifications

• Number of pieces: 35
• Material: Ground high-speed steel (HSS-G)
• Maximum bit length: up to 290 mm
• Coating: Gold ferrous oxide surface treatment
• Tip type: No-walk (reduced walking on start)
• Shank: Anti-slip design on diameters 5 mm and above
• Case: Modular stackable medium tough case with clear lid and inner dovetail system

How to use

Select a drill bit diameter appropriate to the hole required and secure it in the drill chuck ensuring the anti-slip flats engage for larger sizes. Mark the drilling position and, where practical, use a centre punch to prevent the tip walking. Start drilling at low speed to establish the hole and then increase speed as appropriate for the material. For deep holes or continuous drilling in metal, use intermittent pecking and withdraw the bit regularly to clear chips and apply cutting fluid or coolant to manage heat and extend bit life. Store bits in the supplied case to protect cutting edges.

What to consider before purchase

• Intended material: designed primarily for ferrous metals; not for masonry
• Required hole depth: includes bits up to 290 mm for deep drilling
• Drill compatibility: ensure your drill accepts the available shank sizes and that anti-slip flats are compatible with your chuck
• Workload and hardness: for very hard alloys consider higher-grade carbide or cobalt bits

Usage recommendations

Use reduced speeds and cutting fluid when drilling metals to reduce heat and prolong bit life. For deep holes, use peck drilling and remove chips frequently. Keep bits clean and stored in the case to maintain accuracy and prevent damage.