This is a heavy duty vise. The head is fixed on shaft and do not pivot up and down Jaws can be rotated and locked. Included is a heavy duty clamp mount to attach your vise to a work surfaces up to 1-1/2" in thickness. The vise is a little tricky to adjust in the beginning, but once you have the cam ring adjusted, the vise is easy to work with. Jaws are removable, see other auction for FV2153 for compatible jaws. Accommodated hook sizes 2/0 to 22. Works with optional FV2148 and FV2149 pedestal bases.