... /75, Φ 45/90, Φ 45/100, Φ 50/105, Φ 51/105, Φ 55/110, Φ 55/120, Φ 60/132, Φ 80/143, Φ 80/156, Φ 92/188 ... Screw straightness: 0.015mm/m Chrome plating thickness: 0.01-0.1mm Bimetal coating thickness 1.5-2.0mm Material: Base material 38CrMoAlA ...