[Compatible Models] The generator interlock kit is compatible with for QO or for Homeline 150 or 200 amp panels. [Spacing Space Required] 1 3/8 inches between main and generator breakers. [Safety Generator Interlock Kit] This kit avoids the inconvenience that may be caused by unexpected power outages. It is used to safely route generator power to any circuit in your home. This is a really great way to safely hook up your generator while ensuring you have access to all your . [EASY TO INSTALL] The generator interlock kit provides a 3/16 bit, sturdy steel, and easily passes through the breaker panel. Easy to install, no additional control box or wiring required. Please note:There is a slight color difference or difference in kind, it does not affect the use, please do not mind, thank you! Colour:Silver Material:Aluminum alloy Package Contents: 1 * Generator Interlock Kit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.