This is a set of antenna adapter kits perfectly adapted to your car! Please check your car's compatibility first.If it is compatible,go ahead and get a new set of antenna adapters for your car radio antenna! Material:Aluminum + Copper Product size:As shown in the picture Package includes:8 antenna screws + M6 M6M7 adapter + 2 rubber washers We promise to bring you the most intimate shopping experience.Whether you have any questions about our products before you buy,or any problems after you receive the goods,please feel free to contact us,we will reply you as soon as possible and provide you with solutions. Happy shopping! ?High Quality?: We use high hardness aluminum alloy and copper to make this antenna accessory set, which allows this kit to prevent rusting and discoloration. Due to the high hardness, it is also not easy to deform and fall off, so it can be put on your car antenna safely and smoothly. ?Easy to install?: This antenna kit does not need to use other tools, you just need to spend a little time, maybe even less than a minute to screw it on from the bottom of the antenna, it can be installed and used correctly, it will not take up much of your time and energy. ?Compatible models?: This kit has special compatible models, please check the compatibility of your car first. Our parts are compatible with GMC 2006-2012, 2015-201 Canyon, 2002-2009 Envoy, 2007-2021 Sierra, 1999-2022 Sierra 1500, 2001-2003, 2005-2006 Sierra 1500 HD, 1999-2004 Sierra 2500, 2001-2022 Sierra 2500 HD, 2007 Sierra 2500 HD Classic, 2001-2006 Sierra 3500, 2007 Sierra 3500 Classic, 2007-2022 Sierra 3500 HD, etc. ?Set includes?: Including 8 different antenna matching screws, M6 adapter (H=23mm, od: 11mm), M6 M7 adapter (H=25mm, od: 11mm), and 2 rubber washers. ?Compatible models?: Compatible with Chevrolet 2014-2017 Suburban, 2000-2014 Suburban 1500, 2000-2013 Suburban 2500, 2016-2017 Suburban 3500 HD, 2000-2017 Silverado1500, 2007 Silverado 1500 Classic, 2001-2003, 2005-2006 Silverado 1500 HD, 2007 Silverado 1500 HD Classic, 2000-2017 Silverado 2500, 2001-2017 Silverado 2500 HD, etc. For more specific models, please refer to the details page.