DescriptionMade of premium polyoxymethylene material, which is durable and practical for the lasting use. Perfect for laboratory experiment and experimental lesson. It comes with lightweight, provides convenience to use. Features the long finger grip, which can efficiently ensures your safety. The material enjoys the strong durability.Features- Color: As shown. - Material: POM. - Size: 4.50 x 3.30 x 1.20cm/ 1.77 x 1.30 x 0.47 inch. - Use for glass ground joint, will not corrode or scratch glass. - This keck clip has flat and smooth surface because of premium quality material and advanced technology. - This keck clip is made of polyoxymethylene, perfect for any science or home laboratory. - To prevent a joint from separating during a reaction process, the keck clips can be used to secure the two sides together. - The clips are used to hold ground glass joints glassware when assembling laboratory set-ups (reflux, distillation, sublimation, etc.)