This milking lid has a locking handle slot. The two-nipple design features exceptional workmanship and fine polished stainless steel construction. The 2 nipples have ID of 5/8". ID of the lid is 7-7/8". Lid fits buckets which measure 4.7" (120mm) between top of bucket and bottom of handle. Gasket is included. Wt. 2 lbs.