AVN Motorsports 12x1.25 Acorn Lug Bolt Chrome Heat Treated Conical Seat Wheels Rims (12mmx1.25 Thread Size) 17mm Hex (20 Pieces) (28mm Shank) All lug bolts are forged, not cut from bar stock. Forging allows for better mechanical properties and consistent quality. Our threads are rolled (forged) onto the bolt, not cut. 60 degree acorn seat. All lug bolts are made of 1045 carbon steel and heat treated to 10.9 grade. Carbon steel is an alloy known for it's very good formability, comparatively high strength, and a high luster surface finish. All lug bolt finishes are corrosion tested using a 48 hour salt spray. Please refer to the photos for additional lug details.