General Tools 376D Shallow Pot Ceramic Magnets, 50-Pound Pull Ceramic magnets are both powerful and permanent in nature; these strong magnets are capable of lifting and suspending objects many times their own weight These shallow pot magnets are designed for use in tight spaces and have been predrilled for fastening rods or bolts The heavy lifting capacities of these magnets make them a great choice for use in industrial or professional settings Shallow depth permits use of these magnets in confined spaces This magnet has a diameter of 3-1/4 inches and depth of 7/16 inch, with a clearance hole diameter of 9/32 inch; Pulls up to 50 lbs