Vigor V1919 Screwdriver Socket Set for Inside Hexagon, 1/2"

Drive: Square, Hollow 12.5 mm (1/2 Inch) And Output: Inside Hexagon Profile Heat Treated For The Correct Balance Of Strength And Hardness. Designed And Tested To Reach Studs In Difficult Work Areas., Weight: 6.61 pounds, Manufacturer: Vigor