Features: hexagonal according to DIN 3129 / ISO 2725-2, square socket according to DIN 3121 / ISO 1174, for machine operation, phosphated, chrome-molybdenum, technical data: key width (mm): 100, diameter: 1.7 mm, weight: 11500, total length: 1.0 mm, material: finest chrome-molybdenum, steel key width: 3 15/16 inches, note: ISO 1174, DIN 3129, depth ISO 2725-2, DIN 31258 mm.