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Long lock screw machine, which is different from ordinary lock head, it specifically for some of the need to avoid the interference, or space is too small, and the situation of the transfer need locks, it can use this universal coupling and spring structure design, this design is clever, function better, can be used in the design of the clever to achieve the purpose of this model is converted into step or iges universal model download, please reference!Also includes 3d original files, welcome to download! If you like,you can paypal for you to get this models or if you have any questions also you can email to me.