Plastic-head thumbscrews with hex drive speed up securing and loosening components on an optical table or breadboard. The large 3/4 in. (19mm) diameter thumb wheel allows for quick hand tightening of optical components which once in place can be better secured with the built in hex drive. US 1/4-20 and metric M6 versions are available for quick use on the optical table as well as smaller 8-32 versions.
Ideal for quickly fastening components to the optical table.