🍃This pipe tacker gun is used to fix 20mm pipe staples(Inner Diameter) that fix underfloor heating pipes into the insulation layer. 🍃Specifically designed to improve fitter efficiency and comfort as well as dramatically speeding up installation. 🍃Material : steel, aluminum 🍃For use with 20mm(Dia) tacker staples 🍃Package Includes 1 x Underfloor Heating Pipe Tacker Gun .