BLACK - JSK - 7-Sided Heptagon - Plated Steel Racing Wheel Lock LUG NUT for CHEVROLET/GMC 90-03 PRIZM Special Heptagon (7-Side) Locking Design Lightweight Forged Steel Material helps lower unsprung weight and rotational mass (Just below 23 Grams Each) Conical 60deg Acorn seat base / 31.75mm Height by 19mm Width / Comes with x1 17mm Locking Socket Tool Package includes x20 Lug Nuts Note: The SELECTION provided is ONLY a guide. To insure proper lug nut selection, refer to your current lug nut & wheel to determine correct lug nut style, seating, and thread size for your vehicle.