Twist drill bit DeWalt DT4908-QZ, right‑hand rotation, 1 pc, blister pack

DeWalt DT4908-QZ is a single right‑hand rotation twist drill bit supplied in a blister pack. Designed for drilling a range of high-alloy steels and other metals, this 1-piece bit is intended for use in handheld and stationary drills where a standard twist bit is required. The bit incorporates a cobalt-enriched high-speed steel body, an optimised tip and flute geometry for faster penetration, and design details that reduce walking and improve grip and hole quality.

Advantages

The 5% cobalt content maintains a sharper cutting edge and gives significantly longer life compared with conventional HSS-R bits. A no-walk tip improves initial positioning and penetration on flat or curved surfaces, producing cleaner, more accurate and burr‑free holes from 5 mm diameter and up. Size markers are placed away from the grip zone for easy reading on larger diameters. For diameters 5 mm and above a three-sided no-slip shank reduces slippage in the chuck, while a strengthened central core increases fracture stability during freehand drilling. The optimised tip and flute design also evacuates chips faster and reduces heat build-up to sustain cutting performance.

Suitable for

• Drilling high-alloy steels, including heat- and acid-resistant steels
• Drilling stainless steel and chrome-nickel alloys
• Drilling cast iron, bronze and welded seams
• General-purpose drilling with handheld and bench drills

Key specifications

• Rotation: right‑hand
• Pack quantity: 1 piece in blister pack
• Material: high-speed steel with 5% cobalt
• Tip: no-walk tip for easier penetration and cleaner holes
• Shank: three-sided anti-slip shank for diameters 5 mm and above
• Core design: reinforced central core for improved fracture stability (from 4.8 mm diameter and up)
• Performance: optimised flute and tip geometry for faster penetration and improved chip evacuation

How to use

Select a drill and chuck suitable for the bit diameter and secure the DT4908-QZ in the chuck so the shank is clamped firmly. For best results use the recommended rotational speed and cutting fluid appropriate for the material being drilled. Position the no-walk tip on the marked drilling point, apply steady axial pressure and start drilling at low speed until the tip has established the hole, then increase speed as required. Clear chips regularly and avoid excessive feed or speed that can cause overheating or premature wear.

Usage recommendations

Use cutting fluid when drilling stainless and high-alloy steels to reduce heat and extend tool life. For portable drilling, maintain firm, stable support of the workpiece and use a center punch or pilot hole for precise starts on smooth surfaces when drilling below 5 mm where guidance features are reduced.