Armeg EBS Single Box Cutter (65150)

Hi, this must be used in conjunction with a round cutter that is designed to remove the bulk of the material. The square cutter is then used to remove the corners and form a square. The round cutter can be seen here https://www.screwfix.com/p/armeg-ebs-tri-cut-circular-cutter/65294 Or there are kits that contain both cutters and some other components too, here https://www.screwfix.com/p/armeg-ebs-tri-cut-single-box-kit-4-pcs/64930 and here https://www.screwfix.com/p/armeg-ebs-back-box-wall-chasing-installation-kit-7-pcs/67733 The depth the square cutter will cut to depends on the depth you remove with the round cutter. 45-50mm deep is easily achievable