This 5 pack of 600 Grit (ultra fine) sandpaper sheets provide a fast cut rate and a smooth, consistent result. Ideal in wet, oil or dry sanding applications of varnish, enamel, primer, lacquer and sealers. These waterproof sheets offer an excellent option for sanding and finishing hard and soft woods in combination with a sanding block (sold separately) or for hand sanding applications. The Cami-graded aluminum oxide abrasive and rugged waterproof B-weight backing stand up to tough sanding applications without cracking or chipping.