Ideal Measurement: the coupler kits come with the ideal size and thickness-about 0.1 inch/ 2.5 mm to accommodate wire diameters of 4-6mm; Designed to suitable match your batten grid panels and wire grids
Suitable Hole Size: Grid Wall Clips with an ideal hole size of about 0.26 x 0.26 inch/ 6.5 x 6.5 mm, they provide a well fit and stability; This makes it easy to fit to your cable tray system without much hassle