58-1/2 Inch Truck Box mounts on the bed side wall to provide 3.2 Cu. Ft. of usable storage space. It offers rugged security and improved resistance to moisture. The 3-layer RSL™ rigid structural lid has a reverse beveled inner liner and rigid foam insulation for superior rigidity & strength. It is the strongest, most rigid lid we have tested. Adjustable lid striker keeps the lid locked down tight. 9-gauge C-channel striker body will not bend. High-strength body resists cargo damage and protects the locking system. Self-rising lid has heavy-duty gas spring lid lifts. Full-length bin for storing hand tools and parts. Leak-proof stainless steel paddle handle and full weather stripping seal out moisture and dust.  For Longer Tools and Equipment Fits most fullsize trucks. 58 1/2" L x 12 1/8" W x 11" H