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Essential equipment in most laboratories, a wide array of clamps, holders, lab jacks, rods and supports are available. specification: Grip Diameter: 13mm; Units: 1; Effectively clamp off hoses and control the flow of solutions! The Mohr's Pinchcock Clamp easily fits over standard size tubing. The screw-form Hoffman clamp allows added control by a screw type adjustment which allows more or less air or liquid through.