The speaker cover is used for 10"inch speaker, not 10"inch, not suitable for each 8"inch speaker, please read the size and confirm whether it is applicable to your speaker or not before purchasing. Thanks!!! This product is not automatically stuck. It needs glue to bond the iron mesh and plastic ring. Glue needs to be prepared by yourself Due to manual measurement,please allow 0.5-3mm deviationFrame Material: ABS Mesh Material: Cold Rolled Steel Surface Treatment: Spray Environmental Protection Paint Method of Use: Screw Lock, Glue (Glue needs to be prepared by yourself) Frame Color: Silver, Golded or Black Mesh Color: Black Plastic Frame Max Outer Diameter: about 285mm(11.22) Inner Diameter: about 256mm(10.08) Diagonal Screw Holes Distacne: about 238mm(9.37) Error: 3mm(0.12)