Lead ring
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A lead ring, also called O-shaped flask weight, lead ring flask weight, weight rings or just flask weight is a type of weight used to hold steady flasks in a water bath.
General
Lead rings are circular metallic rings, made of steel or lead (as its name suggests), coated in vinyl or some other protective coating. Some models are not completely closed, and instead have a C-shaped form.
Availability
Lead rings are sold by lab suppliers.
DIY lead ring
A simple lead ring can be made by taking a metallic ring and coating it in a protective layer, such as Plasti Dip.
The metal for the ring could be either a large steel ring, thinly cut metal pipe, an old and cleaned large (ball) bearing, a circular bent rebar, a piece of car suspension spring, etc. Lastly, one can cast one such ring using molten lead (or tin, zinc, etc.), then coat the resulting item in paint or some other protective paint.
