Features: hexagonal in accordance with DIN 3124 / ISO 2725-1Internal square in accordance with DIN 3120 / ISO 1174 with ball groove, spark free explosion protected, corrosion resistant, wear-resistant aluminium bronze (non-iron alloy), technical data: key width (mm): 7Square drive material: 258 inches, diameter: 170 mm, shape: polished chrome vanilla length: 63.0 mm, total length: 117mm.