WINDOW/DOOR FRAME FIXING SCREWS, WOOD MASONRY CONCRETE DIREC
200/pack These Concrete screws are used to drive through PVC frames, timber, plate, etc. The embedment into the masonry should be between mm dependent upon the quality of the base material. Concrete Frame Screws key features:-Torx 30 counter sunk head with a heavy zinc coating giving good corrosion protection Aggressive thread form design gives a consistent tapping and superb holding power the non expansion fixing allows fixing closer to the edge of substrate. The installation of the concrete screw uses no expansion plug or sleeve, therefore you may need to drill a hole 10mm longer then the concrete screw.