Genius Tools 9 Piece 1/4", 3/8" & 1/2" Dr. Impact Extension Bar Set IE-2349 9 Piece 1/4", 3/8" 1/2" Drive Impact Extension Bar Set Included Sizes: 1/4" Drive in 50mm, 100mm, 150mm lengths; 3/8" Drive in 45mm, 75mm, 150mm lengths; 1/2" Drive in 50mm, 125mm, 250mm lengths each piece has a special cut out in the tray to easily determine any missing pieces Sizes are stamped for easy identification of size and will not rub off Made of Chrome Vanadium Steel Comes in a plastic blow molded tray for easy storage and labeled for easy organization Limited lifetime warranty against manufacturer defect Meets or exceeds ANSI Specs Made for Professionals, Trusted by Professionals