ESD Safe Utility Table Clamp for Magnifying Lamp - Matte Black, 1/2-inch (13mm) DiameterThis replacement clamp for magnifying lamp firmly fastens to the table and securely holds the magnifying lamp in place. The clamp opens up to 2 3 8 inches (60mm). Easily adjusts to a table, work bench, or desktop surface less than 2 3 8 inch thick. Hole diameter of 1 2 inch (13mm). Designed for MG1630 series magnifying lamp with a mounting diameter of 1 2 inch. Durable, heavy duty metal base provides wider contact point on the bottom of the table.