Monkeybrother Lawn Aerator Shoes /Spikes Aerator Sandals for Aerating Lawn or Yard,3 Straps with Zinc alloy buckle PP material sturdy base , 3 durable straps with zinc alloy buckles to avoid buckles breaking or the sandals coming off. UPDATE: This one pair totally can displace old model(2 straps with plastic buckles).Heavy duty metal buckles won't break, and secure with one easy pull,Unique 3 adjustable straps design keeps any sizes shoes in place. No need expensive lawn equipment and lawn service, just owning it and walking your lawn, you also can do yourself. Lawn Aerator Shoes can allow air, water and nutrients to reach the roots for a healthier lawn. and let grass to absorb more and grow flourishing. Very easy to install and a mini wrench(FREE) to make it easy to install the spikes.