PIPE & Tube Tack Welding Clamps - Pipe and Sanitary Tube Tacking Clamps are an essential tool designed to reduce costs and increase quality and profitability on sanitary stainless steel tube welding projects. Features: durable stainless steel construction and available in sizes ¼" od. through 6"od. This is no flimsy tool - it is designed to outlast competitors and pay for itself.