Panduit PUM-049-M30 Fir Tree Push Mounts have a unique alternating barb design that allows it to lock securely into position. They require a panel hole diameter of 0.18 to 0.19" (4.6 to 4.9 mm) for application. For use in indoor and outdoor environments and with miniature, intermediate and standard cable ties. Made of Heat Stabilized Nylon 6.6, are black in color and come in packages of 1000.