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Call them what you like, ducks or whales or simply weights...these are heavy, made of SG Iron (spheroidal graphite cast iron) for strength, weight, and shock resistance.
They're quite utilitarian... nothing fancy--just your basic finish and an exceptional price--and ideal for your drafting/lofting floor work. For desk work, you might want to add those little round felt stick-ons. And yes, ideal for keeping your papers together when your pals throw open the office windows.
And, if you want to make your own (longer, shorter) wires, and you would want to use a die for thread size 1/8" BSW (British Standard Whitworth).
How about a set of 5?
Spline Weight
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