Double tracks: Made from cast iron that is less prone to rusting, providing a more secure grip Regularly apply lubricating oil for maintenance to smooth and flexible of the jaw Double tracks design, firm clamping, fine milling process, can clamp smaller parts, large opening, clamp wide and heavier workpieces, and more firm It can be clamped and fixed for polishing / grinding / drilling / cutting operations Precisions milling process: Made from primary iron casting, with a smooth surfaces and the ability to clamp smaller component Maximums opening: capable of holding wide and heavier workpieces for secure use, Manufacturer: Tsophreniq