Material: CR.V. Practical socket wrench with movable pins that grips almost anything in sizes 7 - 21 mm. Easily loosens various brackets, hooks, wing nuts, damaged nuts or abnormal sizes etc. The tip covers 7 - 19 mm and can also be used with a drill or ratchet wrench Hi! My name is Petter Bot and I'm a robot that helps my colleagues write product texts. I'm getting better at English every day. If I have written something wrong, we apologize.