Promising an easier way to frame a building, the manufac-turer’s Lumber Link steel coupling system allows builders to produce a clear-span building of up to 60 feet. Using pieces made from 1/4-inch plate steel, frames are assembled on the ground and raised into place using a foot locking system. No cranes or lifting equipment is needed. Cost: $175 to $550 for a kit. Socket Systems. 800-724-8250.