Compatible with 1982-2002 Chevy Camaro; 1984-1996 Corvette C4; 1994-2004 Chevy S10 & S15; 1982-2002 Pontiac Firebird; 1994-2001 GMC Jimmy; 5x4.75 bolt pattern; 87.1mm bore; 12x1.5 studs CNC-machined to match your vehicle's 5x4.75 bolt pattern with an 87.1mm hub clearance bore; flush-seated mounting via correctly torqued lug nuts delivers consistent, secure fitment mile after mile Constructed from 6061-T6 billet aluminum with a durable black anodized finish; CNC precision machined for clean seating surfaces and corrosion-resistant performance season after season Adds 1 inch (25mm) of additional wheel clearance per side for a wider stance; allows fitment of aftermarket wheels without changing suspension geometry or requiring a new alignment Bolt-on design with pressed-in 12x1.5 studs; includes open-ended lug nuts; sold as a pair (2 spacers); use hand tools and a torque wrench only; professional installation strongly recommended Add a wider stance and open up your aftermarket wheel options with these 1 inch (25mm) bolt-on wheel spacers designed for popular GM performance and light-truck platforms. Each spacer bolts directly to your existing hub studs and provides a fresh set of pressed-in 12x1.5 studs for your wheels. Sold as a pair of 2 spacers. COMPATIBLE WITH: Compatible with 1982-2002 Chevrolet Camaro Compatible with 1984-1996 Chevrolet Corvette C4 Compatible with 1994-2004 Chevrolet S10 Pickup Compatible with 1994-2004 GMC Sonoma Compatible with 1991-2001 GMC Jimmy Compatible with 1991-1994 Chevrolet S10 Blazer Compatible with 1982-2002 Pontiac Firebird and Trans Am Compatible with 1985-2005 Chevrolet Astro Van Compatible with 1985-2005 GMC Safari Van Compatible with 1995-2005 Chevrolet Blazer (full size) All fitments require 5x4.75 (5x120.65) bolt pattern, 87.1mm hub bore, and 12x1.5 lug thread pitch SPECIFICATIONS: Bolt Pattern: 5x4.75 (5x120.65mm) Thickness: 1 inch (25mm) Hub Bore: 87.1mm Centering: Lug-centric Stud Spec: 12x1.5 Outer Diameter: 164mm Material: 6061-T6 Billet Aluminum Finish: Black Anodized Quantity: 2 (Pair) INSTALLATION & SAFETY: For off-road and competition use only. Install with a torque wrench using hand tools — never air or power tools. Confirm the spacer seats fully against a clean hub with no gaps, and that factory wheel studs do not protrude past the spacer face (trim or replace shorter studs if needed). Torque lug nuts to the vehicle's factory specification, not to exceed 110 ft-lbs. Re-torque all lug nuts after the first 25 miles, then periodically. Professional installation is strongly recommended.