Anti slip decking plates the aluminium anti slip plates are 62 5mm x 635mm in size and come complete with six countersunk holes and rounded corners to ensure a clean and aesthetic appearance the anti slip surface is a durable mixture of diamond hard aluminium oxide with a thick plastic carrier and permanent adhesive for a long life the adhesive is water resistant it is made from 1 6mm weatherproof aluminium finished on the top with a long lasting anti slip coating ideal for use with gro