BlueSpot 3/4" Drive 1000mm (39") Power Bar The BlueSpot 3/4" Drive 1000mm (39") Power Bar is manufactured from carbon steel, with a chrome-molybdenum steel head for increased strength and durability. The power bar is for use with 3/4" sockets where extra torque or reach is required due to tight or tough location of fixings. Manufactured from chrome molybdenum for increased durability. Length: 1000mm (39"). 3/4" Drive.