Use these lawn aerator strap on shoes to aerate even the hardest of soils. Each shoe measures 11.8"L x 5"W and contains 13 spikes. Each spike is 2" long to provide the deep hole in the soil. Simply secure the spikes with the included nuts and wrench. The 3 adjustable straps mean the shoes will fit any foot securely. The buckles are made from durable zinc alloy so can withstand continuous use in all kinds of weather. By Trademark Innovations.