Hook head screw with hexagon nut and washer, can be used at any point in the profile. For anchor rails/profile rails: 2985, 2986, 2988, 2990 with 18 mm slot width Dimensions (approx. dimensions) Head length: 33.7 mm Head width: 14 mm Head height: 10.5 mm Thread: M 10 Length L: 30 mm Strength class: 4.6 Material: Steel, galvanized. according to DIN EN ISO 4042, blue passivated