These 4 pieces 6 lug wheel spacers are 2 inches or 50mm thick with a 6x5.5 inches or 6139.7mm bolt pattern allows for 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 vehicle's performance in handling and traction. Wheel spacers extend the wheels outward the vehicle giving it a more agressive look, which also allows for large brake caliper installations or lift/lowering kits. Fits the following vehicles: 1999-2012 Escalade 2000-2005 Astro 2007-2012 Avalanche 2002-2006 Avalanche 1500, 2500 1993-2000 C2500 2002-2012 Express 1500 1994-1998 K1500 1994-2000 K2500 1999-2012 Silverado 1500 2001-2006 Silverado 1500 HD 2000-2012 Suburban 1500 1995-2012 Tahoe 1994-2000 C2500 1994-1999 K1500 2003-2005 Safari 2003-2012 Savana 1500 1999-2012 Sierra 1500 2001-2006 Sierra 1500 HD 1992-2012 Yukon 1999-2006 Yukon Denali 2000-2008 Yukon XL 1500 Wheel Spacer Specifications: Thickness: 2 inches or 50mm Vehicle Bolt Pattern: 6x5.5 inches or 6x139.7mm Wheel Bolt Pattern :6x5.5 inches or 6x139.7mm Studs: M14x1.5 Center Bore: 108mm This is a compatible replacement part manufactured by AA Ignition. This wheel spacer kit is NOT a genuine OEM part. Vehicles makes and their associated vehicle models and part numbers are used in this listing only to identify the vehicles this wheel spacer kit fits.