Manufactued from heavy duty close grained high tensile seasoned cast iron , with a precision rotary head four way block. This block is made of hardened and ground tool steel . The hardness is to specification 55+-3 and parallelism <0.015. The vice has horizontal movement each side 0- 90 degrees and the jaw block rotates on the axis. The Jaw block can hold circular jons in both Vertical& horizontal planes. A fully graduated swivel base is also a handy feature!