M3 M4 M5 M6 M8 M10 M12 Cage Nut Square Hole Server Rack Mount Cabinet PC Fixing
Hole Size 6.8mm x 6.8mm. Hole Size 9.5 x 9.5mm. Hole Size 12.3 x 12.3mm. Hole Size 14 x 14mm. If there are any problems, then we will try to resolve them for you. No fitting instructions are provided with the product.