This primary guard protects your heel, yet doesn't hide your open primary. It measures approximately 3.75" deep, and fits any Evo open primary plate. Included are 5 guards, 10 spacers (all made from aircraft quality polished aluminum) and chrome bolts and washers. If you are running a 1.5" open primary plate, you will need extra long bolts, in the options below. If you want extra fins and spacers, they are $40 per set. Please make your choice in the options section below. Each extra spacer / fin set increases the width by .75".