JB Distributors' 12/3 Round 100-Foot Extension Cords With Triple Tap, which are UL Approved, come in boxes of three. The cords are 15 amp and are ideal for plumbers, electricians and sheet metal contractors. These cords are good for using saws alls, circular saws, hammer drills and any product that needs heavy-duty ampage, including hand grinders. The Triple Tap lets you plug in three units at one time.