Cast Iron Slotted Weights are typically used with a hanger that also has its weight calibrated so the hanger can be used as part of the overall weight under test. Weight hangers are available in a variety of lengths and weight capacities. Hangers are calibrated to a mass value, and also
have a capacity of how much weight can be loaded onto them.

To determine which hanger will accommodate your weights, use the stem height of the hanger
as the maximum height, then use the thickness dimension of each weight along with the quantity you intend to place on the hanger to determine the total height of your stack of weights.
The height of your stack of weights should be less than the length of the hanger. The dimension of the hook opening is ½ inch.