Gator Rackworks Replacement Layered Diced Foam for Rack Mount Drawer; 4U Insert (GRW-DRWFOAM-4) Replacement Diced Foam Block for use with any Rackworks Standard Depth 4U Drawer Layered Polyurethane Diced Foam with 1/2" pluck configuration Available for 2, 3, and 4U sizes