This Stens Universal Tri-Pro Trimmer Head is an integral component for your trimmer to ensure smooth operation and beautifully manicured lawns. This replacement trimmer head has been developed with insights from lawn care professionals to ensure optimal performance. For starters, Stens trimmer heads have been designed for quick and easy loading of new trimmer line. You'll save both time and effort when loading new line. The trimmer head smoothly glides over the turf grass to ensure a uniform and even cut that looks highly professional. The trimmer line advances as needed to keep fresh cutting edges available. Finally, these trimmer heads are durably made to handle the rigors of lawn and landscaping work. Stens trimmer heads have earned a reputation for ease of use, excellent performance and high durability.