"I've used both 10mm &12mm sizes of these drills. Size 12 is better for drilling through the cavity wall for putting cable for an external electrical socket. It did perform better with my mains powered drill than my cordless 18v hammer drilling through block & brick walls. A fair price for an above average drill bit."
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Review 3 for Erbauer Pro Masonry Drill Bit 12 x 400mm