Allows extra clearance between the wheel and the wheel hub assembly increasing the offset which allows for larger tire installation to the vehicle. Wheel spacers also increase a vehicle's performance in terms of handling and traction. The further the wheel is from the hub assembly, the better its grip. Wheel spacers extend the wheels outward the vehicle giving it a more aggressive look, which also allows for large brake caliper installations or lift/lowering kits. The wheel spacers are 1 inch thick with 108mm center bore diameter, 14 x 1.5 threaded studs and a 6x139.7mm bolt pattern. Compatible with the Following: 1999-2017 Escalade 1993-2000 C2500 1994-1998 K1500 1994-2000 K2500 1995-2017 Tahoe 2000-2017 Suburban 1500 1999-2017 Silverado 1500 2001-2007 Silverado 1500 HD 2002-2017 Express 1500 2007-2013 Avalanche 2002-2006 Avalanche 1500 2000-2005 Astro 1994-1999 K1500 1994-2000 C2500 1999-2017 Sierra 1500 2001-2007 Sierra 1500 HD 2002-2010 Sierra Denali 1992-2017 Yukon 1999-2006 Yukon Denali 2000-2008 Yukon XL 1500 2001-2006 Yukon Denali XL 2003-2017 Savana 1500 2003-2005 Safari This is a compatible replacement part manufactured by AA Ignition. This wheel spacer kit is NOT a genuine OEM part. Vehicle makes and their associated vehicle models and part numbers are used in this listing only to identify the vehicles this wheel spacer kit fits.