They fit regular-mouth (standard Mason) jars and other jars with a regular-mouth opening.

They are intended for hand soap, dish soap, lotions, gel soaps, hand sanitizer, and even some condiments such as mustard and ketchup.

Listings note leak-resistant features such as removable silicone gaskets for a leak-proof seal, lockdown saddle heads to prevent accidental pumping, and other leak-resistant seal materials.

Sprayer caps offer adjustable output (from higher-output spray to gentle mist) for tasks like watering plants or applying cleaners. Pump lids are intended for dispensing soaps, lotions and condiments. Some sets include both a sprayer lid and a pump lid.

They are not suitable: product details explicitly state these pump lids are not intended for canning or heat-processing applications.