The Ryobi ExpandIt String Trimmer Attachment is a high-quality power head designed for use with Homelite trimmers. This bladed head attachment is made of durable carbon fiber material and features a modern design with a 14" to 16" cut radius. It operates on a battery-and-gasoline engine with 1 HP of power, providing a 70 dB noise level and a 30-minute battery life. This unit is easy to assemble. Pops on to your existing string trimmer head.