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Yeah the mouse closes the hook, not something you want when you're messing with molten metal.

Looks like either a foundry hook or a sorting hook, designed to be really easy to grab stuff without messing around with safety stuff like a mouse, which you don't want to do in certain applications.

Post a picture if you can, Crosby is top of the line. Lots of different configurations and purposes for all the different types of hook, super handy to have for different stuff.