Feature: 1. Adjustable: Lab clamp has a built in cam head holder that can be easily attached to lab stand or other equipment and can be adjusted to any angle with a stop nut. 2. Pressure Adjustment: Laboratory clamps with adjustment screws help provide precise pressure adjustment and effectively prevent glassware breakage. 3. With Rubber Coating: The jaws have a nonslip rubber coating to prevent scratches and breakage of glassware. 4. Multipurpose: Not only for professional labs, but also a good choice for science classrooms and everyday use at home to hold glass objects. 5. Stainless Steel: Lab stand clamp is made of stainless steel, which is not easily damaged and rusted, and can be used for a long time. Specification: Item Type: 3 Prong Lab Clamp Material: Stainless Steel, Rubber Product Size: Approx. 22.1 x 7.2 x 3cm / 8.7 x 2.8 x 1.2in (Manual Measurement with 0.1 to 0.2cm error) Maximum Opening: Approx. 9cm / 3.5in (Manual Measurement Error of 0.1 to 0.2cm) Use: Used for Clamping and Fixing Various Laboratory Equipment and Glassware. Package List: 1 x 3 Prong Lab Clamp Note: Manual Measurement with 0.1 to 0.2cm error