Coghlan's Deluxe Tablecloth Clamps are made of durable ABS plastic and designed to hold tablecloths firmly on patio or picnic tables up to 2 inches thick. The spring-loaded clamps are easy to use and come in a package of 4, making outdoor dining with family and friends a breeze. These clamps offer a worry-free and enjoyable outdoor experience by keeping the tablecloth in place, even in gusty weather.