The black seal screw has a raised ridge across the entire circumference, making it easier to hold and seal.
These black lids are premium material, to provide good torque retention, reusable and durable, the poly will not rust over time.
Insert the cone into the sealing area to create a tight closure to prevent liquid leakage, prevent carbonation, and prevent gas leakage, to provide you with a good closure and air-tight seal.
38mm poly screw can be provided to the variety industries to produce a good sealing effect, and also can fit well as replacement caps for your 38 mm wide glass bottles ans so on.
Please sure that the diameter of the bottle mouth is 38mm before purchase, otherwise it will not be applied.