Moeller's Stainless Steel Cushion Clamps have a nominal diameter of 9/16 (14mm), thickness of 0.06, and width of 1/2 (13mm).
With a screw size of 10, these clamps prevent corrosion and reduce noise. They are also resistant to oils, acids, saltwater, shock/vibration, and have a temperature range of -50°F to 300°F.
Mount with 1/4" clearance hole.