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Hole Saws

Hole saws cut large-diameter holes in timber, metal, plastic, and masonry. Pick by material: bi-metal for steel and wood, TCT for abrasives like brick or tile, diamond core bits for concrete and stone. Arbor compatibility matters — check the thread and pilot drill fit before you start. Worksafe and Sealey covers most jobsite needs.

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Choosing the right cutter depends on what you're drilling through. Bi-metal hole saws handle wood, plasterboard, and thin steel — good general-purpose choice for electricians and plumbers cutting access holes. Tungsten carbide-tipped (TCT) saws bite through brick, tile, and fibre cement without the teeth dulling in three cuts. Diamond core bits are for concrete, stone, and hard masonry — the dry-drill versions here run without water, which speeds up small jobs but means short bursts and regular cooling pauses to stop the segment overheating.

Diameter and depth determine what fits. Core-to-Go bits come in 38mm through to 150mm diameters, all with 150mm cutting depth — enough for most single-skin blockwork or slab penetrations. Pair with the correct pilot drill: the 75mm pilot suits smaller arbors, the 105mm handles the bigger core bits. A wobbly pilot or wrong thread turns a two-minute job into an hour of swearing and a blunt bit.

Cutting speed matters. Too fast in masonry and you glaze the diamonds; too slow in metal and you work-harden the surface. Let the cutter do the work — steady pressure, clear the spoil, and if it's binding or burning, stop and check you're using the right type for the material.