Three different hoop diameter sizes come in the package. All clamps have a built-in jackscrew for attaching securely to lab stands or other platforms.Laboratory Ring Clamp Specifications:Material: Cast iron.Stand attachment method: Built-in jackscrew.Category: Laboratory supplies.Colour: Black & blue.Lab ring clamp size: 20x11x4cm.Lab ring hoop diameters: 60; 80; 100mm.90 degree – double lab clamp size: 10×2.5×3.5cm.Package: 3x laboratory rings 1x 90 degree – double lab clamp.
