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I have an entire pallet full of these police.
The overall diameter is 12.25 in.
The board diameter is 1 in.
It is a bore to fit, single groove A section pulley.
It has two holes in the spokes for mounting a counterweight.
The key slot size is 1/4 in.
![AK124 bore 1\](img-large/g/VfAAAeSwVaZprJmw/s-l1600/AK124-bore-1-OD-12-25-One-Groove-Sheave-Pulley-Gea.jpg "AK124 bore 1\")
