McMaster 1815T13 Beam Clamp, for 2 7 16" to 3 1 4" High Strut Channel, Zinc Plated Steel G1020747 Tool And Die Set Up Tool And Die Set Up Thickness (mm) 0 0 in to 6 in Outside Micrometer Millimeters Measured Maximum 25 mm Caliper Millimeters Measured Minimum 0 mm Outside Micrometer Inches Measured Minimum 0 in Caliper Inches Measured Maximum 6 in Caliper Inches Measured Minimum 0 in Caliper Millimeters Measured Maximum 150 mm Outside Micrometer Inches Measured Maximum 1 in Style 1—Mounting plates grip the beam flange while the square U bolts cradle the channel Zinc Plated Steel—Strong and durable with a zinc plating that protects from occasional exposure to moisture