1.5 inch thick NSTRUCTION hdpe sheets st-HDPE sheets 4×8 [5 HDPE SHEETS] Dimensions: 1/4 inch thick ± 20 mil × 12 inch wide ± 1/5 inch × 24 inch long ± 1/5 inch ; Easy for cutting, drilling, machining, and welding. Perfect for DIY projects. These rigid plastic sheets have unlimited applications.