Options: SnapNrack Standard Rail Set, 122", Clear SnapNrack Standard Rail Set, 122", Black SnapNrack Standard Rail Set, 162", Clear SnapNrack Standard Rail Set, 162", Black SnapNrack rails are sold in pairs, as rail sets, offered in two lengths to simplify ordering. The 122-inch clear anodized rail set accommodates a single row of 3 modules in the 200-watt range. If you are installing 5 module rows, each row will use one 122 inch rail set and half of a 162 inch rail set. For other module widths, calculate rail length for your installation and remember to add 1/2" between modules for mid clamp spacing. These light-weight aluminum rails can be cut with a chop saw or circular saw with a carbide blade, a saber saw with a metal cutting blade, or a hack saw.