Post Shields - (3.5" x 3.5" x 4" High Black: Protects mailbox and fence posts from grass trimmer damage. Post Shields are an affordable solution to protect and cover wooden posts from nicks, cuts and scrapes from everyday yard work and improve the appearance of your property! Post Shields look great and are easy to install. Simply slide the shields together around the post and increase your property's curb appeal. Made of durable plastic, Post Shields protect your property and improve the appearance of your home or office!