1/2", H-Style, Pipe Clamp, H-Shaped Foot Assembly Stabilizes The Clamp In Two Dimensions Giving Dual Axis Stability, Extra High Base Provides Industry Leading Clearance From The Work Surface, Cast Jaw For Durability, Smooth Action Spindle, Soft Protective Pads Included, Clamping Strength & Opening Size Are Dependent On Length Of Pipe Used.