Diall Zinc-plated Steel Masonry Screw (Dia)7.5mm (L)112mm, Pack of 30. These concrete screws are ideal for drill a hole of required diameter (7.5 mm) and depth, with a driver drill screw through the fixture into hole until fixing depth is reached and then tighten the screw. They're great for use with door, window, solid brick, perforated brick, concrete and hollow blocks. Concrete screw by Diall.

Brand Name	Diall