Drill bit DeWalt DT9584-QZ, 800 mm length, single piece

DeWalt DT9584-QZ is a single 800 mm drill bit designed for deep drilling applications where extended reach and reliable performance are required. Supplied as one piece per pack, this extra-long bit is intended for use with compatible chucks and rotary hammers to create long, straight holes in masonry, concrete, brick and block work. The drill bit features a hardened steel body and a multi-cutter head to maintain stability during deep penetration and reduce the risk of breakage under load.

Advantages

The 800 mm length provides extended reach for through-holes and formwork applications without needing extensions. A hardened body increases resistance to bending and wear, while the optimized mounting shank ensures secure grip and efficient power transmission from the tool. The solid two-cutter head with two individual cutting tips offers improved penetration, faster drilling speed and longer service life compared with conventional bits of similar size.

Suitable for

• Drilling long clearance and anchor holes in masonry, concrete and stone
• Create through-holes in timber formwork when combined with appropriate backing or guide
• Professional construction and renovation tasks requiring extended reach
• DIY projects where deep or hard-to-reach holes are needed

Key specifications

• Overall length: 800 mm
• Pack quantity: single piece
• Material: hardened steel body for increased strength
• Head type: solid two-cutter head with two individual cutting tips for fast penetration
• Shank: optimized mounting shank for secure grip and power transmission
• Intended materials: masonry, concrete, stone, brick and block work

How to use

Install the bit into a compatible drill chuck or SDS-plus holder according to the tool manufacturer's instructions, ensuring it is fully seated and secured. Begin drilling at low speed to establish the hole and then increase speed and apply steady forward pressure appropriate for the substrate. For deep holes, withdraw the bit periodically to clear debris and allow the flutes to remove dust and fragments; this reduces heat build-up and improves cutting efficiency. Use appropriate personal protective equipment including eye protection, dust mask and hearing protection.

Usage recommendations

Use the DeWalt 800 mm drill bit with rotary hammers or drills rated for long-bit operation; avoid excessive side loads or bending forces. For best results in reinforced concrete or very abrasive substrates, use intermittent drilling and clear debris frequently. Store the bit in a dry, protected location to avoid corrosion and inspect the cutting tips before each use for signs of wear.