【SPECIFICATION】4 Pack 3" C Clamps, 3-1/4 Inch Jaw Opening, Throat Depth: 2.0 inch, Jaw pad width: 1 inch. 【INDUSTRIAL STRENGTH C CLAMP】Made of heavy-duty cast iron, durable and high hardness. Coated surface construction protects your clamps from moisture, preventing rust and corrosion from damaging your G clamps. 【NO DAMAGE & NON-SLIP】Swiveling clamp pad floats in a low-resistance ball-and-socket joint to apply pressure evenly and prevents marring while turning the clamp screw. 【ADJUSTABLE T-BAR HANDLE】Sliding T-Handle offers suitable maximum torque in order to reduce hand fatigue; Low-resistance screw threading minimizes binding and sticking during operation.