Features Strong and versatile: the capper head is made of excellent metal and rubber materials, is suitable for a variety of sizes of bottle caps, has good heat resistance, high mechanical strength and is not easy to age. Applicable size: the waterproof and leak-proof safe cut plate of the special rubber pad is tight, the diameter of the lid is 30-40 mm and the height of the bottle is not restricted. Widely used: our bottle cap head is suitable for all kinds of plastic bottles, glass bottles, laboratory test tube bottles, centrifuge bottles, medicine bottles and other round bottle caps. Do not destruction or wear: with adjustable coupling, caps can effectively avoid damage, reduce wear inside the plug. Easy and portable: easy to carry and use, can be easily used for tightening, loosening or turning various screw caps. Specification: Item type: hand electric cap sealing machine head. Material: metal and rubber. Cap diameter: approx. 30 ~ 40 mm/1.18 ~ 1.57 inches. Bottle height: Unlimited Rubber pad outer diameter: approx. 60 mm / 2.36 inches. Rubber pad height: approx. 17 mm / 0.67 inches. Widely used: suitable for all types of plastic bottles, glass bottles, laboratory test tube bottles, centrifuges bottles, medicine bottles and other round bottle caps can be used Package list: 1 x head of the electric lock machine. Note: This product must be used together with an automatic bottle sealing machine (cannot be used alone). Package List 1 x Handheld Electric Cap Sealing Machine Head