Silverline Diamond Core Masonry Drill Bit 28mm x 300mm 670870

Silverline Diamond Core Masonry Drill Bit 28mm x 300mm

Barcode: 5055058104311

MPN: 670870

Overview:

Diamond Core Masonry Drill Bit 28mm x 300mm a premium core bit designed for dry cutting clean, accurate holes in masonry materials. Built with a heavy-duty steel body and diamond grit cutting segments, it’s ideal for common building and plumbing tasks such as creating cable runs, pipe routes and service penetrations through brickwork and similar substrates. With a 28mm cutting diameter and 300mm working length, it’s well suited to deeper core drilling where a neat, controlled hole is required. This bit is designed for rotary drilling only—hammer action must not be used, as it can damage the segments and increase risk during use.

Key Features

• 28mm x 300mm diamond core bit for masonry drilling

• Diamond grit cutting segments for dry cutting clean holes

• Heavy-duty steel body for strength and stability

• Integral hex arbor for secure drive and reduced slip

• Suitable for general building, plumbing and service installation work

• Precision drilling when used with the correct drill and technique

• Do not use with hammer action

Specifications

• Brand: Silverline

• MPN: 670870

• Barcode: 5055058104311

• Product Type: Diamond core masonry drill bit

• Size: 28mm x 300mm

• Arbor: Integral hex arbor

• Finish: Painted

• Hardened: Yes

• Tip / Segment Material: Alloy with diamond grit (approx. 20%)

• Abrasive Connection: Sintered

• Segment Details: One piece, 4 slots, 3.0mm x 8.0mm

Applications

• Creating holes for plumbing and heating pipework

• Drilling service penetrations for electrical cable runs

• Ventilation, boiler and HVAC pipe routing (size/task dependent)

• General masonry core drilling in brick and similar materials

How to Use

• Confirm you have a 1/2" BSP compatible arbor setup if required by your drill/adapter system

• Use a drill fitted with a safety clutch for controlled operation

• Mark the hole position and start slowly to establish the cut

• Keep the drill in rotary mode only (no hammer action)

• Apply steady pressure and withdraw periodically to clear dust

• Allow the bit to cool as needed during dry cutting

28mm Diamond Core Bit 670870 – Key FAQs

• What materials is this core bit suitable for?
  It’s designed for dry cutting clean holes in masonry materials such as brick and similar substrates (application dependent).

• Can I use this with hammer action?
  No. Do not use hammer mode—it can damage the diamond segments, reduce performance and increase risk during drilling.

• What size hole does it cut?
  The cutting diameter is 28mm, with a bit length of 300mm for deeper drilling applications.

• Do I need a specific arbor?
  It’s intended to be used with a 1/2" BSP compatible arbor where required by your drill/adapter setup, and it includes an integral hex arbor for drive.

• Why should my drill have a safety clutch?
  A safety clutch helps control torque if the bit binds, improving handling and reducing the chance of injury or tool damage.

• What’s the best technique for dry core drilling?
  Start slowly, keep steady pressure, avoid forcing the bit, and clear dust regularly by backing out slightly—this helps maintain cutting speed and segment life.