5 x Diamond Dry Core Drill Bits: 38, 52, 65, 117 and 127mm. Leave a review. 1/2in BSP threaded compatible with standard core drilling machines and accessories. Hand Tools. We are an independent, family-owned Builders Hardware and DIY warehouse in Haverfordwest, Pembrokeshire where we hold one of the biggest ranges of workwear you will find anywhere in the country.
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