Designed to fit either 2x4 or 2x6 studs. 21 in. diameter wire shock absorbing wire tray Capacity: 100 lbs. Greased retaining spindle gives trouble-free service eliminating maintenance over long periods Spindel spring adjusts to desirable free spool Wire guide also serves as a carrying handle Designed for 14-2, 14-3, 12-2, 12-3 wire Rotational wire guide allow pulling in any direction Rasied edges on wire trays prevent wire spill Eliminates twisting and kinking of wire Constructed of high grade steel, zinc, and aluminum