One piece metal lids are for regular mouth mason jars and has a straw hole at the middle.
One piece lid. Do not hassle with old style caps anymore.
Works with 4 oz, 8 oz, 16 oz regular mouth mason jars such as Nakpunar, Ball, Kerr Brands.
Also known a 70/450, 70CT, 70G, 70mm, 70 Continuous Thread Lid.
These are unlined lids.
Made in USA