We have 1/2 series sleeve 8MM to 32MM, material CRV, quenching hardness to 40 degrees or more, surface treatment with mirror surface, matt, and two-color, inner hole with hexagonal and twelve-corner, They are auto repair, home tools, factory maintenance equipment maintenance assistant, you will love it when you use it, he can bring you happiness, labor saving and time saving. If you want more time with your family and want to save more effort, then choose it and won't let you down!What are you waiting for? Hurry up and place an order! !