Double Naplock Threshold strip, made from brass which is durable and easy to cut, install and maintain. Designed to achieve a secure and neat join between two carpets. The gripper teeth hold the carpet firmly but also allow stretching. – Used when finishing an exposed carpet edge. – Typically used at a door threshold. – Can be screwed, nailed or glued down to the subfloor. Approximate coverage for one strip (2.7 m) will be 3 average door ways or one large. Price per 2.7 metre length strip.