In order to guarantee the four-wheel or front wheel locator measuring head can accurately fixed on the wheel, four-wheel positioning device production enterprise combining the accuracy requirement of products, and the design for all kinds of fixture, the fast three locking assembly self-centering is good in all kinds of fixture design principle and practical application effect of fixture, also is the most promising and worthy of further study of fixture. 

However, the accuracy of the fixture and the measuring head of the four-wheel locator is to match, in short, the high-precision measuring head must be matched with high-precision fixture, otherwise the high-precision measuring head is meaningless.