These are some 1/2" inch alloy spikes (screwback) -- a bag of 50 . These spikes are Zinc Alloy plated with a nickel finish to give them a silver look. They each come with a screw for application . You get 50 of these in the bag . They are great for dog collars, Punk, Gothic, and any custom leather work. The size is as follows: Height is 1/2" * 5/16" in diameter. Comes with screws that holds the spikes in place. you get 50 spikes and 50 screws. These screw spikes are great for any DIY Punk Goth Biker or what ever Project. Tell a friend about us. Be sure to add me to yourfavorites list!