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What's That Slot?

Utility that highlights which items can be placed in an item slot.
by Gegy
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2,571,734 downloads
0 likes
Updated Jul 6, 2026
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Utility & QoL

What's That Slot

This mod is a simple utility that allows you to query which items can be placed in a specific slot by holding down Left-Alt. The mod supports both Forge and Fabric- make sure to select the right file!

This is particularly useful in modded environments where it may not be clear what items can be placed in a modded GUI.

Demonstration

Relevant items can also be quickly transferred from your inventory by clicking on them in the query window: Demonstration of Quick-Move

This mod works client-only, so it does not need to be installed on the server to run!

What's That Slot 1.3.8 for Minecraft 1.21.5
MC 1.21.5, NeoForge
Release 2025-03-28 Get
What's That Slot 1.3.8 for Minecraft 1.21.5
MC 1.21.5, Fabric
Release 2025-03-28 Get
What's That Slot 1.3.6 for 1.21
MC 1.21, Forge, 1.21.1
Release 2024-08-24 Get

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