Record IRWIN Mechanics vices are the most popular and widely used general purpose vice for light to medium-duty applications. The vice has high quality grey iron castings that resist distortion under severe pressure, with a smooth action provided by dovetailed, long barrelled, unbreakable nut and hardened steel replaceable jaw plates. Record Irwin No.1 Mechanics Vice. Jaw Width: 75mm (3in). Irwin Record No.1 Mechanic Vice 75Mm (3In) in Blue