Featuring patented BOLT Breakthrough One-Key Lock Technology the BOLT Coupler Pin Lock works with your vehicle ignition key. Fully adjustable from 1/2" to 3 3/8" the BOLT Coupler Pin Lock slides back and forth with ease to fit virtually any coupler. The stainless steel pin gives you the security you have come to expect with BOLT Locks while the lock shutter keeps out dirt and moisture. Opens with your vehicles ignition key eliminating extra keys on your ring; Works with late model Chevy, GMC, Buick & Cadillac keys Fits couplers From 1/2" to 3-3/8" wide Lock slides along stainless steel pin for ease of use, 1/8" incremental adjustments ensure a snug fit Stainless steel lock shutter to keep out dirt and moisture, plate tumbler sidebar to prevent picking and bumping Limited Lifetime Warranty MODEL NO - 7025284