Feature: 1. APPLICABLE SIZE: The waterproof and leakproof interface of the special rubber pad is tight, the diameter of the lid is 30‑40mm, and the height of the bottle is not restricted 2. WIDELY USED: Suitable for all kinds of plastic bottles, glass bottles, laboratory test tube bottles, centrifuge bottles, medicine bottles and other round bottle caps can be used 3. STRONG AND VERSATILE: The product is made of excellent metal and rubber materials, suitable for a variety of sizes of bottle caps, possess good heat resistance, high mechanical strength and not easy to age 4. EASY AND PORTABLE: Easy to carry and operate, can be easily used to tighten, loosen or rotate various screw caps 5. NON DESTRUCTIVE OR WEAR: With adjustable clutch, can effectively avoid cap damage, reduce the wear inside the plug Specification: Item Type: Handheld Electric Cap Sealing Machine Head Material: Metal and rubber Cap Diameter: Approx. 30 ~ 40mm / 1.18 ~ 1.57in Bottle Height: Unlimited Rubber Pad Outer Diameter: Approx. 60mm / 2.36in Rubber Pad Height: Approx. 17mm / 0.67in Widely Used: Suitable for all kinds of plastic bottles, glass bottles, laboratory test tube bottles, centrifuge bottles, medicine bottles and other round bottle caps can be used. Package List: 1 x Handheld Electric Cap Sealing Machine Head Note: This product must be used together with automatic bottle cap machine(cannot be used alone).