The STSC-75 is a 0.75 oz (21g) Stainless Steel Balancing Clamp, 5/16" throat size. This is made of 303 stainless steel with allen cup point set screw 8/32 x 1/2" SS.
Allen wrench size 5/64" fits this screw size.
Screws and Allen Wrenches can be purchased here
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