25mm Drill Bits

Whether you're running plumbing pipes, routing thick electrical cables, or sinking heavy-duty structural anchors, our professional range of 25mm drill bits is designed to power through the toughest materials. Built for high-torque applications and deep boring, these heavy-duty bits deliver clean, accurate clearance holes exactly where you need them. Keeping a dedicated 25mm bit in your kit eliminates the need for frustrating re-drilling and helps you maintain momentum on site.

We offer a comprehensive selection of 25mm profiles to match your specific application and power tool. Choose from extremely durable SDS plus and SDS max hammer bits engineered to drive through dense concrete and blockwork with minimal vibration. For fast and clean timber clearance, our 25mm range includes rapid-cutting flat wood bits, deep-boring auger bits, and extreme tri-flute bits. We also stock reduced-shank HSS blacksmith bits for metalwork, as well as specialised dry diamond hole saws for hard ceramic tiles. Ensure professional results with stock from trusted brands like Bosch, DeWalt, Toolpak, and Mexco.

Frequently Asked Questions | FAQs

What is a 25mm auger bit used for?

A 25mm auger wood drill bit is specifically designed for drilling deep, clean, and accurate holes into thick structural timber, such as joists and beams. They feature a threaded tip that pulls the bit through the wood and a deep spiral flute that efficiently clears away the large volume of sawdust created by the 25mm head, preventing the bit from jamming.

Can I fit a 25mm drill bit into a standard combi drill?

Most standard combi drills and drill drivers have a maximum chuck capacity of 13mm. Therefore, a standard 25mm straight-shank drill bit will not fit. To drill a 25mm hole with a standard chuck, you must use a "reduced-shank" bit (often called a blacksmith drill bit for metal, or a flat wood bit for timber), which features a stepped-down base designed specifically to fit 10mm or 13mm chucks.

What is a 25mm SDS Max drill bit used for?

A 25mm SDS Max drill bit is designed for heavy-duty rotary hammers and features a much thicker, more robust shank than standard SDS Plus bits. This extra strength allows it to withstand extreme hammer action, making it perfect for drilling deep, wide 25mm holes into dense concrete, reinforced masonry, and blockwork for large structural anchors and pipework clearance.