VEVOR Impact Socket Set 3/4 Inches 22 Piece Deep Impact Sockets, Socket Assortment 3/4 Inches Drive Socket Set Impact Standard SAE Sizes 7/8 Inches to 2 Inches Includes Adapters and Ratchet Handle

All our products come with a 12-months warranty. Here is the link: https://www.vevor.com/pages/return-policy

Hi buyer， Thank you for your time to the mail. 8cm/3.1inch. Hope this helps. Best wishes, Jennifer Customer Support