Proskit SK-V418B, VDE 1000V Insulated 1/2″ Drive Socket 18mm DescriptionFeatures:1/2″ Square DriveFor metric hexagonal head screws.Chrome Vanadium steel.Specifications: Material: 50BV30Width across flats mm: 18Outside diameter Max. mm: 29.5Length mm: 38.0Individual packing: Blister card enquire now