Black Metal Screw Spike Motorcycles Helmets Bikers Harley Davidson Custom Bike Helmet Parts Accessories Plus Bonus Stick on Rubber Shark Fin (Helmet Not Included) full weather proof motorcycle bike harley helmet metal spike plus peel and stick rubber shark fin Helmets not included black metal spike - 2 3/4 inches tall with a screw Meets or exceeds DOT Snell requirements FMVSS 218