Mahogany over Walnut Fastcaps adhesive screw covers work great to conceal your countersunk screws on cabinets, furniture, point of purchase displays and elsewhere. Fastcaps simply peel and stick on to add a finishing touch! Mahogany over Walnut Fastcaps are 9/16" diameter and just 1/32" thick. Material is high impact PVC plastic. The adhesive will cure and get stronger over time. Also, adhesive is waterproof when applied to a clean dry surface and allowed to cure. Bulk available.