We have a set (4 pcs) of 720x400mm boring mill jaws in stock. Its base is 720mm length and bolt-hole-centerlines distance is 400mm. It can either be mounted on a vertical lathe or a horizontal lathe. Please contact sam@songenmachinery.com to have more details of it. It has clamping force boosting gear sections fitted on each base, enabling each jaw's clamping force to reach about 400KN when exerting an input driving torque of 400N.M or so.