Engineering Brick Blue Perforated Class B 65mm (Pack of 400)Elevate the durability and performance of your construction projects with our Engineering Bricks. Engineered to withstand severe conditions, these bricks offer exceptional weather resistance, frost resistance, and a low salt content. Their 3 hole vertical perforated configuration enhances both strength and flexibility, while their compliance with a range of stringent standards ensures high quality performance. Ideal for applications where technical