Package Included Each kit contains 2 rack mount ears, 8 sets of switch screws(8xM3 + 8xM4), 4 sets of cabinet kits (screws + snaps). Perfect for switch rack mounting needs.*Note: Our adjustable rack ears have four sizes. Please select “Small, Medium, Large, Extra Large” according to your switch size. Adjustable Rack Mount Kits The shortest distance between the two mounting holes is 14mm, and the longest distance is 29mm. You can adjust the installation distance according to the size of your switch. As long as the hole spacing of your switch is within this range, it is applicable. Wide Compatibility Compatible for most of 17.3 inch Buffalo Tech, Cisco, NETGEAR, compatible with Dell, D-Link, Linksys and TRENDnet Products. Please check the compatibility model list blow before purchasing to ensure this rack mount kit is compatible with your switch. Special Feature The mounting hole distance is 14-29mm, which can be adjusted, suits for more switch models. It is also good for some speaker rack mount kit. 100% SATISFACTION SERVICE If you have any question about our product, please feel free to contact us. We will take full responsibility for the product quality and try our best to solve your problem quickly and efficiently!