Our medium pin concrete Carpet Gripper comes with pre-nailed masonry nails 20mm (3/4\") long for a firm fixing into concrete floors and is suitable for use on all carpet types. The ideal product for stretch fit carpet installations, our gripper is made from high grade resin bonded plywood, five ply (6mm) thickness, machined on one edge to a defined angle and penetrated from the underside by two rows of passivated pins. The Pins are set at an angle of 60deg to eliminate pull-out and bending, even when power stretching. The carpet backing is then held in place by the pins to allow for correct tension.