Rigid & Robust Vices designed for smooth operation & Reliability. Manufactured from high quality grey iron castings very strong material with excellent shock absorbing capacity and immense strength under compression. Steel jaw are hardened 45 ± 5 HRC for increased resistance to wear. Knurling on the jaw ensures a firm grip of the workpiece. Perfect alignment of main screw & nut reduces wear giving long trouble free service. High tolerance machining. Smooth one finger operation. The unbreakable SG Iron nut securely locked in the body ensures max. thread surface contact and constant alignment between the body & the jaws.