This is a high-quality replacement spool retainer designed for use with Homelite brand 2-stroke engine nailers. The item is made of durable metal and is compatible with a range of models, including the Ryobi H250SF Straight Finish Nailers (Husky), R250SFA Straight Finish Nailers, Ridgid R175RNA Coil Roofing Nailers, and R175RND Coil Roofing Nailers. The spool retainer is designed to securely hold the spool in place and ensure accurate nail placement. Assembly is required for this item, which has a horsepower of 1 HP and a 50 cc engine size. It is sold as a single unit and weighs 0.3600 lbs. The item measures 1.750 inches in length, 3.250 inches in height, and 1 inch in width. It is suitable for use with 110 volt power source and does not come with a battery.