Alukap-XR Fixing Buttons are manufactured to be used for centre point fixings for Axiome Multiwall Polycarbonate Roofing sheets. The fixing buttons are designed to provide greater protection from the elements such as wind uplift on sheets with wider bar-to-bar spacing. Specification Dimensions: H55 x W40 x D55mm. Colour: Brown Capacity: 10 Pack Extra strength for sheets Self-assembly required