Durable 7.5mm T30 countersunk masonry screws are used to directly fix window frames to masonry, concrete and lightweight block. These have a bright zinc plated finish. Lengths range from 80mm to 180mm – all boxed in 100’s. The screw thread patterns facilitate easy insertion into masonry materials and result in a secure hold. A pilot drill of 6mm or 6.5mm diameter is required. To complement the masonry screws why not use the Torx30 x 25mm driver bits?