These heatsinks came from a Cisco Nexus 93108TC-FX switch and are sold without mounting hardware.
Residues of heat conducting media and light scratches possible
Dimensions: height: 28.7mm
Hole diameter: 4,4mm
Hole grid: 56mm x 38mm
Material bottom: nickel-plated copper
Material fins: Aluminum nickel plated
Suitable as Do-It-Yourself cooler