Tighten the spring-loaded socket head cap screw on these clamps to hold your workpiece from above. Also known as swing clamps, you can rotate the hook out of the way when the screw is loose. Install these clamps in a drilled hole for maximum rigidity.

Add mounting blocks to rotate the clamp’s hook consistently—these blocks have a stop every 90°. They’re also useful if you don’t have an easy mounting location for the fixture clamp.

For technical drawings and 3-D models, click on a part number.