The Retrogrip Screw is a 20mm x 3mm stainless steal screw for fixing your Retrogrip decking insert to your decking. A good external grade adhesive should be perfectly sufficient to secure your Retrogrip to your decking. In some circumstances it may be necessary to add an extra mechanical fix such as if your decking is old and uneven.

Box of 50 No. 20mm x 3mm Stainless Steal Screws