This line of Craftsman ratchets is excellent quality and the mechanism is reliable. I have a set I received new in the 90's. They have taken a lot of overloading abuse without failure. I bought this to add to my field tool kit for work. The thumb-wheel on the back is convenient for starting fasteners. If you like a quick release/lock button for sockets this line of ratchets does not have that. This does not have any external plastic parts.