The makeup of economical stainless steel weight sets varies.
Slotted weights 10 to 500 g (0.1 to 5 N) are made of stainless steel, and weights 1 to 5 g are made of aluminum. All slotted weights have an approximate diameter of 1⁵/₈" and have a slot opening width of ¹/₄". A hanger is also available from which you can stack and hang your slotted weights. The overall length of the hanger is approximately 7⁷/₈" with a usable length of 7". The hanger is designed to accept the slotted weights.
Weights are adjusted to tolerances specified by ANSI/ASTM E617 Class 7.