The 3M Electrical Spec. part MP3551/MP3552 is a high-quality hole plug designed for snap-in installation. This plug is specifically designed to fit a .875-inch hole with a maximum panel thickness of .062 inches. Made of durable black HS nylon and measuring 1.016 inches in outer diameter with a thickness of .250 inches, this hole plug provides a secure and professional finish for a wide range of electrical applications.