Power A Fastener: For fastening new roof covering and insulation material to an old bitumen felt roof, or for fastening an insulation sheet to another piece of insulation material (e.g. Styrox, foam sheets, polyurethane sheets). The length of the fastener should be chosen according to the thickness of the insulation material. Made of strong polyamide (nylon); standard colour is black. The square body is stronger than a round body, and prevents the tool being used from spinning around during installation. Power A adjustable Fastener: For fastening new roof covering and insulation material to an old bitumen felt roofing or for fastening an insulation sheet to another insulation material (e.g. Styrox, foam sheets, polyurethane sheets). The length of the fastener is chosen according to the insulation thickness. Adjustable Power A fasteners have 50 mm adjustment margin in the length. Made of strong polyamide (nylon), the basic colour is black. NV Distance Piece Fastener: Designed for use in board-clad exterior wall construction as a distance piece between the frame and the fixing battens of the external cladding. Suitable for use with both soft and hard insulation. Construction projects which make use of distance pieces have improved heat insulation and save timber material. The distance piece should be selected according to the thickness of the insulation. This EPD consists of the properties of Power fasteners, adjustable Power fasteners, and NV fasteners.