This product is a good helper for auto repair and household use. The sleeve is made of CRV material and quenched to a hardness of 40 degrees. The ratchet wrench is quenched with 45 teeth. This product has 19 sleeve, 2 spark plug socket, a 10 inch extension rod, and a universal joint and a ratchet wrench,12 wrench plus a plastic box, a total of 32 samples, in terms of repair, can save us a lot of effort and a lot of time, even children and old people can use, if you love your home, love to repair, please select it, it can make your life beautiful!