StrongHand Heavy Duty 4-in-1 Clamp 20-1/2" x 5-1/2"Sliding Arm Clamps with the Removable Reversible Clamp Arm and Unique Accessories The 4 in 1 Utility Clamping System is the most versatile Sliding Arm Clamps in the market. The three piece 4 in 1 Clamp Kit includes: Sliding Arm Clamp Extended Block V Pad All Strong Hand Tools Utility Clamps are made of high quality heat treated steel and nickel chrome plated for strength and durability.