TRUVUE: 3-3/8 Inch Circular Ceramic Magnet - Center Hole : ( Pack of 2 Magnets ) This magnet is 3-3/8 (more exact is 3-7/20") inches in diameter, and weighs 10 ounces This magnet is excellent for holding small tools and hardware while you complete your work This ceramic magnet has a center hole that is 1 inch in diameter; about 1/2-inch thick C5 or (Y30) Grade - useful in welding and in collecting machine shop metal shavings This magnet has many applications in manufacturing and industry