Slide Rail, 3-Stage, Side Mount, 4518 Type, 4518-350, Set of Left and Right - Length: 350 mm - Width: 35 mm - Type: Slide Rail - Material: Steel - Features: Ball bearing type - Mounting holes: Multiple mounting holes Thank you for viewing. I have been using these at home for a computer keyboard counter. I have also included some example photos for DIY use, so please take a look for reference. The two photos show the dimensions of the slide rail when extended.