BOLT 7018518 Padlock for late model Chevrolet, GMC, Hummer, Buick, Cadillac, Potiac and Saturn Keys Opens with your vehicles ignition key eliminating extra keys on your ring; Works with late model Chevy, GMC, Buick & Cadillac keys. Please verify fitment by looking up the year, make and model of your vehicle 2" Chrome plated 5/16" Diameter hardened steel shackle Stainless steel lock shutter to keep out dirt and moisture, plate tumbler sidebar to prevent picking and bumping, double ball bearing locking mechanism Limited Lifetime Warranty