Sim·Fix has been specially designed to re-fix all sizes of slates which have slipped from their original position. Because the position of the retaining clip can be adjusted, Sim·Fix can be used to secure all sizes of commonly used slates. As well as securing the slate against slippage as with traditional clips, the Sim·Fix also secures against wind-uplift. Material Made to last, Sim·Fix slate straps are manufactured in nylon, which is resistant to normal extremes of temperature and atmospheric pollution. Colour The black Sim·Fix is virtually invisible once fixed in position.