Bestop 18145-01 ZipRail Tonneau Cover for 1999-2004 Nissan Frontier Crew Cab, 4.5' bed Attaches with Bestop's original Belt-Rail system for peel-back closure New integrated bows for sleek appearance and much faster installation No-drill clamp system for secure mounting more tools Premium grade leather-grain vinyl coated polyester withstands weather with mildew and UV resistance 100% access to bed when rolled up