This is just like the seat wrenches you can get in the hardware store, except for one thing, this one’s made from hardened steel. Will fit most seats out there, and it won’t bend under use. Square and hexagonal stepped ends, Square sides measure 1/4″, 9/32″, and 5/16″. Hex side measures 1/4”, 9/32”, and 5/16” as well. Tools cannot be returned or exchanged.