The flexible ridges allow these plugs to stay firm and in place and also allow them to fit a range of square hole sizes.

Durable construction and excellent gliding edges recommend series CCF round plugs for use on a wide range of metal furniture, appliances and similar items. Because they feature a series of externally tapered ribs, a secure fit is ensured. A thick, impact and abrasion resistant base makes series CCF plugs ideal tubing closures for products subject to heavy-duty service or exposure to adverse environments.