The Sealey WDH450 Diamond Blade is suitable for cutting hard materials The Sealey WDH450 has a diameter of 450mm and a bore of 25mm. The WDH450 is suitable for cutting hard materials including concrete with flint over 10NM. Features:    Fast cutting and a long life Suitable for cutting hard materials Engineering bricks, hard facing bricks, hard concrete kerbs and slabs, lintels, clay paviours and pipes, Portland stone, York stone and most hard materials Specification: Bore: Ø25mm Model No: WDH450 Disc Size: Ø450mm (Ø18\")