Heavy-Duty powder coated finish. Additional posts available in various heights (40", 60" or 80") Complete with 11” connector tube for butting rails together in a straight line for desired length Rails built with 2” square holes spaced 4” apart (10 holes). A steel plate with identical holes is welded and boxed inside the rail, 1” up from the bottom 2” square tube posts and 2” square rubber post caps to separate bundles and slabs Rails designed with slots to hold 2 x 4’s which protect the slab edges and the finish on the rails (2 x 4’s not included) Patent # 7143901 Store bundles or slabs in your shop or warehouse with ease in this well designed, patented rack! Assembly Instructions SAFETY WARNING: Maximum Weight Allowed Per Opening Is 9,000 Lbs. (4,500 Lb. Per Post) Minimum Of 2-Degree Angle When Dropping Stone In Between Posts Inspect Posts Each Time Used NOTE: When Assembled The Overall Height Of The Posts Are 5.5” Less Then Listed (EXAMPLE: 60” Post Will Be 54.5” Above The Top Of The Rail)