Drill bit Dedra WPQ1221 — 12 mm diameter, for concrete, brick, stone, aerated concrete, 135° point

Dedra WPQ1221 — 12 mm drill bit designed for use in concrete, brick, natural stone and aerated concrete. This single-piece masonry bit features a 135° point to improve centring and reduce walking at the start of drilling. It is suitable for use with both rotary and hammer drills when creating holes for anchors, dowels and service installations in masonry and stone.

Advantages

The 135° point angle provides stable bite and improved centring, reducing the need for pilot marks. A single-piece construction increases bit resilience under hammer action and minimizes the risk of breakage at the connection. The 12 mm diameter is a common size for dowels and anchor screws, making the bit practical for a range of fastening tasks in masonry. The geometry and carbide tip (typical for masonry bits of this type) ensure efficient material removal and longer service life when used correctly.

Suitable for

• Drilling anchor and dowel holes in concrete and brick
• Creating openings for electrical boxes and conduit in masonry
• Preparatory holes for plumbing fixtures in stone and aerated concrete

Key specifications

• Drill bit diameter: 12 mm
• Point angle: 135° for improved centring
• Compatible materials: concrete, brick, natural stone, aerated concrete
• Single-piece construction for hammer drilling
• Intended use: rotary and hammer drills
• Quantity: 1 piece

How to use

Secure the workpiece or mark the drilling location and fit the Dedra WPQ1221 into the drill chuck according to the drill manufacturer's instructions. For best results in masonry, use a hammer drill mode and apply steady pressure while allowing the bit to do the cutting. Start at low speed to establish the hole, then increase speed as the bit engages. Withdraw periodically to clear dust from the hole. Use appropriate personal protective equipment including safety glasses, hearing protection and a dust mask.

Usage recommendations

Use with compatible anchors and dowels sized for a 12 mm hole. Avoid excessive sideways force and overheating; if the bit becomes hot, reduce speed and allow it to cool. For reinforced concrete, verify reinforcement location before drilling and consider using a bit designed specifically for rebar contact if needed.