Wilton 14870 530, Steel Pipe Clamp Fixture, Deep-Throat, 3/4-Inch Threaded Pipe Ideal For Any Applications Where Extra Deep-Reach Is Required Moveable And Stationary Parts Are Made Of Heavy-Duty, Ductile Cast Iron For Added Strength Multiple Disc Clutch Provides Sliding Jaws With Instant Adjustment, Secure Hold And Quick Release