The Push-N-Load 3-blade replacement trimmer head is a durable blade trimmer head with nylon blades designed to cut through light brush and thick grass. The head is made from carefully crafted glass-filled nylon for superior durability and abrasion resistance, it can withstand the extreme demand of any job. The powerful serrated nylon edges on the blades allow you to cut through thick weeds with ease. With its Push-N-Load technology, blades can be loaded and reloaded in seconds. That means cutting more with less downtime to get the job done faster, leaving you more time to do the things you want.