This is a set of very short impact sockets, approximately 23mm in height. The bottom part is a 17mm hex, making it a convenient socket that can be used with a wrench. It includes 12 sockets ranging from 8mm to 19mm, with a rail. Although I have hardly used them after purchase, there is some surface rust inside a few of them. Please refrain from purchasing if you are concerned about this. Please read the profile carefully, and only those who understand everything are welcome to consider this purchase. No claims and no returns. *Please use the "Price Negotiation" feature for price negotiations. I will respond whether I can accommodate your request or not.