Drill bit set DeWalt DT4929HHS cobalt metal HHS 5 x 86 mm, 10 pcs

DeWalt DT4929HHS cobalt HSS drill bit set contains ten identical 5 x 86 mm bits engineered for drilling into hard metals and alloys. These high-speed steel bits with a cobalt alloy offer increased heat resistance and wear durability compared with standard HSS, making them suitable for repeated and demanding metalworking tasks. The set is intended for use with hand drills and drill presses where precise, clean holes in steel, stainless steel and similar materials are required.

Advantages

The cobalt-enhanced HSS construction improves hardness and thermal stability, reducing bluntness when drilling at higher temperatures. Precision-ground flutes and tips deliver consistent cutting performance and accurate centring. Supplied as a 10-piece set of identical size, the kit ensures repeatable results and fast bit replacement during production or workshop use. The 86 mm overall length provides sufficient reach for most panel and plate thicknesses while maintaining rigidity.

Suitable for

• Drilling holes in mild steel and alloy steels
• Working with stainless steel and other heat-resistant metals
• Precision metal fabrication in workshops and small-scale industrial settings
• Use with hand-held drills and drill presses for through-holes and pilot holes

Key specifications

• Drill bit type: high-speed steel (HSS) with cobalt alloy
• Quantity: 10 pieces of the same size
• Diameter: 5 mm
• Overall length: 86 mm
• Tip: precision-ground for accurate centring and cutting
• Suitable materials: steels, stainless steels and similar hard metals

How to use

Select an appropriate drill speed and apply steady feed pressure while using cutting fluid or coolant when drilling stainless steel or other heat-sensitive materials. Secure the workpiece in a vice or clamp to prevent movement and ensure perpendicular alignment for accurate holes. Start with a pilot hole if required for deeper or larger-diameter follow-up operations. Replace worn bits promptly to maintain hole quality and avoid excessive heat build-up.

Usage recommendations

For best results, use moderate rotational speeds and a continuous supply of cutting lubricant when working at higher temperatures or on stainless steel. Inspect bits for wear and maintain sharpness by replacing rather than regrinding cobalt HSS bits to preserve geometry and performance.