Used to attach boards to steel-system walls and partitions Self-Adhesive, Magnetic Blocks for boards with a steel backing only. Block magnet is provided with a rubber coating which increases the magnetic force. Also prevents damage to walls. Place the magnets in a triangle on the backside of the board for a better grip Suitable for the following Legamaster Boards; DYNAMIC, IMAGINE, PROFESSIONAL, PREMIUM PLUS , PREMIUM, and UNIVERSAL PLUS