This 27 Built-In Microwave Spacer Kit. Stainless Steel Should Be Used To Allow For Flush Installation Into Your Cabinets. The Kit Is Designed To Be Used With Select 27 Stainless Steel Microwaves. See Your Model'S Use And Care Guide To Ensure Compatibility. Applicable For Cutout Heights Between 17-3/8 - 17-3/4. Installing This Accessory Will Require Basic Hand Tools And Novice Installation Experience. You Must Unplug The Appliance Or Shit Off The House Ciruit Breakewr Before You Begin.