"Are clips needed for installation of these sinks?" For the drop-in (self-rimming) sinks, you do need clips. They will be included with the sink. For undercounter mounting, there are no clips made/included. Also, Barclay no longer offers templates for their sinks. They prefer that the hole for the sink
not be cut into the countertop until you have the sink in-hand. When you receive your sink and are ready to cut the hole, you can turn the sink upside down and trace its outline
to create a template. Waiting until you receive the sink to cut the hole allows for slight variations in the shape of each sink.