The SC-5 is a 5.0 oz (140g) Steel Balancing Clamp, 3/4" throat size. This is made of 12L14 steel with allen cup point set screw 1/4-20x1".
Allen wrench size 1/8" fits this screw size.
Screws and Allen Wrenches can be purchased here
Posted by bkd on 5th Apr 2016
These are quality weights that have worked well for me. I've used these weights on some medium speed fans up to 1200 RPM with no issues. Easy on and off beats welding test weights in place. Company service is superb too. These were shipped, billed and received in an incredibly short amount of time. VERY pleased with the service.