Hammer head screw with hexagon nut and washer, can be used at any point in the profile. Use for: series rail 2913 and anchor rail 2914 with 11 mm slot width and anchor rails 2916 and 2917 with 12 mm slot width Dimensions (approx. dimensions) Head length: 23 mm Head width: 10.2 mm Head height: 4 mm Thread: M 8 Length L: 30 mm Strength class: 4.6 Material: steel, galvanized according to DIN EN ISO 4042, blue passivated