Talboys 916129 Nickel-Plated Zinc Large Chain Clamp, 35mm-280mm Holding Size, 206mm Overall Length Chain clamp for securing round or irregular objects to a lab frame, rod, or other apparatus Grip range is 35 to 280mm (1.38" to 11.02") in diameter Slip-on chain connection and an adjusting knob for a firm hold 127mm (5") long extension arm allows the clamp to be set at varying distances from a frame or rod Made of nickel-plated zinc with a chrome brass chain for corrosion resistance