1/8 inch high quality rigid polyethylene sheet for water tank 1.5 inch rigid polyethylene sheet for Water supply-HDPE [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.