Roblox Asset Grabber от 0x00

This extension lets you download Roblox Catalog assets, including Bundles, using the Asset-Delivery API.

This is used for importing items, such as: Gears, Accessories, and Clothing; into your Roblox Studio game.
Just paste the item's ID (Found in its URL, /catalog/ * ID * /Item Name/ ) inside the input box, depending on the item's type (Item or Bundle), then drag the downloaded asset file into the game window.
NOTE: You must rename the file into the file extension ".rbxm" to use in Studio.