The clamp on top of the headspace bottle capping device is a sealing pliers used for headspace bottles. Made of stainless steel material, sturdy and durable. Closely compatible with standard bottle caps. Sealed firmly and reliably. According to the size of the headspace bottle, there are two specifications: 20mm and 11mm. The aluminum cap can be quickly removed with just one grip, and the adjustable headspace bottle capping device provides an adjustable stop point on the handle to ensure consistent tightness of each capping. Adjusting the screws inside the metal jaws can change the depth of the jaws. Characteristics of headspace bottle capping device: Easy to operate and use Specially designed surface coating with good chemical resistance for laboratory use The tough jaws are made of special metal alloy to ensure long-term use A clamp pressure regulator is installed on the operating handle The height of the roll mouth of the capping device can be adjusted by using an Allen wrench on the bolt on the clamp head.