Spindle Diameter: 7.8mm; Material: Plastic; Color: Clear Used to support and lock 3/4 inch thick shelves; To note: Please confirm the thickness of the shelf is less than 20mm before purchase. Self-locking shelf support pegs - Easy to install, make the shelves stay securely in place when you put them on Easy to release - Just press the spring clip, then you can pull the shelves out For a tight fitting effect, the diameter of the holes should be equal or slightly less than pin diameter (slightly less than or equal to 5mm); Please make sure the size you need before purchasing Pin Diameter: 7.8mm Fitting hole diameter: 7.5mm Material: Plastic Color: Clear Clear plastic exterior looks great Used to support and lock 3/4 inch thick shelves Note: Please confirm that the thickness of the shelf is less than 20mm before purchase For close-fitting effect, the diameter of the holes should be equal to or slightly smaller than the diameter of the pin ( slightly less than or equal to 5mm) Self-locking shelf support pegs - Easy to install, make the shelves stay firmly in place when you put them on Easy to release - Just press the spring clip, then you can pull out the shelves Widely used in cabinets, cabinets, cupboards, shelves, shoe boxes and shelves Easy to use - Just install or uninstall by hand, good choice for DIY Note: Small parts, please keep away from your baby and children Package included: 20 x plastic locking pins How to use< /p> 1. Use an electric drill to drill the hole, please use the 7.8mm drill bit. 2. Place the shelf pin in the hole. Note: If the diameter of the hole is larger than the diameter of the shelf pin, you can circle it with tape, then put the shelf pin into the hole 3. Place the deflector on the shelf pin.