MAC - Strong Plier 16D Fixture Table Weld Clamp – Mac Industries UK
Inserta Clamps, Fit 16 mm Holes – Strong Hand Tools
Welding Table Advanced Accessory Pack • Texas Metal Works
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Quick Clamp - 3/4" System
Lincoln Electric Welding Clamp Set - 8 Clamps for 16mm Fixture Holes, Secure Round and Square Tubing, Oversized Heads for Maximum Clamping in the Welding & Cutting Accessories department at Lowes.com