1.SDA is suitable for installation on the basis of a nut, can accommodate a standard flat pad,To be used in bridges that need to withstand vibration, guard rails, rail ways, road facilities and other varieties of iron structures. Peripheral can be labeled as high grade reflective (patent), can clearly display the outline of the illuminated ; It is safety for driving and working at night .http://www.xmsd666.cn

2.SDSW-1 is suitable to be installed in the bottom of the nut or bolt head without flat washers, applicable for pipe flanges, and machinery equipment nut(patent) .http://www.xmsd666.cn

3.SDC-S is suitable to be installed in a anchor bolt nut on the bolt (or column), can accommodate a standard flat mat; Suitable for: steel structure column foot, wharf, bridge guard rail base high lamp screw with longer places, such as cover article in vitro can be labeled as high strength grade reflective around (patent design), can clearly display the outline of the illuminated ; It is safety for driving and working at night .http://www.xmsd666.cn

4.SDC-D is suitable for the anchor bolt in two nut on the bolt (or column), can accommodate a standard flat mat;Suitable for: steel structure column foot, high lamp base, boarding bridge guardrail base, (ship)bridge base and other longer exposed screw nut, cover article in vitro can be labeled as high strength grade reflective around (patent design), can clearly display the outline of the illuminated ; It is safety for driving and working at night .http://www.xmsd666.cn

5.BM is suitable for the equipment needs frequent maintenancet, installation and disassembly is very convenient, can be used repeatedly. Request screw with at least three times or more threads can access (patent)http://www.xmsd666.cn

6. B is suitable for protective screw device, easy installation and disassembly, can be used repeatedly!http://www.xmsd666.cn