Correct 12mm-1.5 thread lug nut with external thread provision for plastic screw-on cap. Designed for Pontiac Firebird models with GTA and other GM factory style aluminum wheels. The lug nut will work with nearly all GM aluminum wheels including the Pontiac GTA and Buick Grand National Mesh style aluminum wheels. 12mm-1.5 thread. Plastic cap not included. This lug nut is a replica of the stock GM nut measuring 1" tall.
