This Thorsman plastic clip with screw 2191055 (set of 50 pieces) is intended for indoor or outdoor installation of round cable in walls and ceilings, with or without a plug Screw with surface treatment according to corrosivity class C3 and cross-slotted head type T20 Color: white Material :C3 steel, clip PP (polypropylene), electroplated steel, screw steel TCS-C3 screw clips consist of a clip in impact-resistant polypropylene with high UV-resistance and is provided with an electroplated steel screw The clip can be fitted without drilling in double and single plasterboard, wood, board materials and low-density concrete with high density It is also suitable for hard materials like concrete or bricks The C3 T20 screw is specially suited for high torque applications like hard wood and concrete The screw has a high pitch for quick installation and a sharp point, and the head is cross-slotted of either type Phillips 2 or of type T20. It penetrates directly into most materials In concrete and bricks it only needs a 4 mm hole