Mid America Building Products – 3″ VINYL SHUTTER-LOK SPIKES “White #001” Choose quantity in “drop down” menu above. Depending how each monitor is adjusted, colors can appear different than actual color. Use (4) spikes per shutter up to 43″ Use (6) spikes per shutter for 44″ and over Drill 1/4″ hole thru shutter and into wall deep enough to accept full length of Shutter-Lok. Gently tap Shutter-Lok thru shutter and into hole. Do not over tighten shutter to wall. Shutters will expand/contract with weather changes.