107mm & 102mm Core Drill Bits

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Diamond core drill bits in 107mm and 102mm (4 inch). 107mm is a popular size for 100mm ducting, extractor fans and flues, and 102mm is the true 4 inch size. Every 107mm and 102mm core we stock is compared below.

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DDM150 Heavy Duty Diamond Drill Marcrist Diamond Drill Marcrist DDM150-1S Diamond Core Drill 110V - Hand-Held Dry Core Drilling Machine up to 150mm

    Marcrist DDM150-1S Diamond Core Drill 110V - Hand-Held Dry Core Drilling Machine up to 150mm

    Minimises repetitive strain and hard work The outstanding power-to-weight ratio of 1900 watts to 4.0 kg. Minimises repetitive strain and hard work with less than 85 dB(A) the quietest diamond drill on the market Ø 45 mm - 152 mm diamond drilling capacity in...
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    Precision Drilling for Concrete, Stone & Masonry

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    Buying guide

    107mm & 102mm core drill bits compared

    Core bit Sizes Type Length Best for
    Marcrist DCU350 107mm Dry (slotted) 165mm Brick, block and soft to medium masonry
    Marcrist DCU550 107mm Dry 165mm Brick and block up to Class B engineering brick
    Marcrist DCU750X 102mm, 107mm Dry 165mm Brick, block, concrete and stone
    Marcrist PC850 102mm, 107mm Dry or wet, percussion drills 165mm Brick, block and concrete from a percussion drill
    Marcrist CCU850X 102mm, 107mm Dry or wet 165mm Reinforced concrete, granite and engineering brick
    Marcrist CCW850X 102mm Semi-wet 165mm or 350mm Reinforced concrete and natural stone with minimal water
    Marcrist WCU350 102mm Wet 450mm Blockwork, brick and concrete
    Marcrist WCU550 102mm Wet 450mm Natural stone and soft to medium concrete
    Marcrist WCU750X 102mm Wet 450mm Reinforced concrete and natural stone
    Marcrist WCU850X 102mm Wet 450mm Highly reinforced concrete and natural stone
    Marcrist WF850X 102mm Wet, rig-mounted 450mm Extremely hard reinforced concrete
    Marcrist PG850V 102mm, 107mm Wet - 20-30mm vitrified porcelain and outdoor ceramics

    Which size for a 100mm duct or flue?

    A 100mm duct in a 107mm hole leaves about 3.5mm clearance each side, enough to feed it through and seal it. 102mm is the metric equivalent of 4 inches (101.6mm) and is a very tight fit for 100mm ducting, so it is mainly used where a 4 inch hole is specified. For boiler flues, follow the boiler manufacturer's recommended hole size.

    Dry or wet core?

    Dry cores (DCU350, DCU550, DCU750X, PC850 and CCU850X) cut without water, so with dust extraction there is no slurry to clean up indoors. The PC850 also runs from a percussion drill. Wet cores (the WCU and WF850X ranges) need a water feed, are the usual choice for heavily reinforced concrete and are often used on a drilling rig. The CCW850X is a semi-wet core that needs only a little water.

    Other popular sizes: 38-42mm, 52mm, 117mm, 127mm and 152mm. Or browse all diamond core drill bits and core drill sets.

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