Drill bit DeWalt DT9521-QZ for rotary hammer, 6.5 mm diameter, 210 mm length, 1 pc

DeWalt DT9521-QZ rotary hammer drill bit, 6.5 mm diameter and 210 mm overall length, supplied as a single piece for professional and DIY masonry work. Designed for SDS‑Plus rotary hammers, this concrete drill bit features a four‑cutter carbide head and a four‑flute spiral that accelerates drilling and improves evacuation of dust and debris. The hardened steel body and 140° tip profile provide reliable penetration and extended service life when drilling into concrete, brick and other masonry materials.

Advantages

The combination of a solid two‑cutter carbide head with two additional cutting tips ensures fast, efficient drilling in hard materials and consistent hole quality. The four‑flute spiral removes material quickly to maintain drilling speed and reduce heat build‑up. A hardened steel shank increases resistance to bending and breakage, while the 140° tip geometry improves initial penetration and prolongs tool life. Engineered for SDS‑Plus systems, the bit fits most common rotary hammers for straightforward installation and secure retention.

Suitable for

• Drilling through concrete for anchor installation
• Creating through‑holes in brick and masonry
• Renovation and construction site drilling tasks
• Light to medium duty professional and DIY applications with SDS‑Plus rotary hammers

Key specifications

• Drill diameter: 6.5 mm
• Overall length: 210 mm
• Shank type: SDS‑Plus compatible
• Tip design: four‑cutter carbide head with 140° profile
• Body material: hardened steel with four‑flute spiral
• Quantity: 1 piece

How to use

Insert the DeWalt DT9521‑QZ drill bit into the SDS‑Plus chuck of a compatible rotary hammer and secure according to the tool manufacturer's instructions. Use hammer drilling mode for concrete and masonry; apply steady, even pressure without forcing the bit. Retract periodically to clear dust, or use compressed air or a dust extraction system to maintain visibility and prevent overheating. Match drilling speed and hammer settings to the material hardness and bit diameter to optimize performance and service life.

Usage recommendations

Wear appropriate personal protective equipment including eye, hearing and respiratory protection when drilling. For best results in reinforced concrete, pre‑locate reinforcement to avoid contact with rebar. Replace the bit when cutting performance declines or when the carbide tips show visible wear.