Check the listing for details. Speaker Grill Guides Plastic Black Ball Socket Type 6mm x 7mm 20 Pairs. Condition: New. Listed at 23.20 USD. What is this?The audio net cover buckle, sub female buckle, is applied to the fixation of the speaker net cover frame and the bookshelves, boxes, and plays the role of dust prevention, decoration, etc.What will I get?The speaker grill guides, we provides here,is in size of:Female Mount Diameter: 7mm/ 0.27 inchFemale Total Size: 9mm x 14mm/0.35 inch x 0.55 inch(D*L)Male Thread Size: 6mm x 5.5mm/0.24 inch x 0.21 inch(D*L)Male Height: 18mm/0.71 inchColor: BlackIn the package of: 20 Pairs x Speaker Grill Guides.Are there any advantages of the product?The speaker grill guides use durable hard plastic, with folding resistance, is the first choice for DIY audio accessories. Sufficient quantities for use and easy to install.How to use it?Steps of installation:1. Just drill holes of appropriate size on the box and grill.2.