Trimmer head, dual line. Fits 90% of straight shaft brush cutter models. No loose springs makes it easy to replace line. Excellent for commercial use. Trimmer head comes with the following mounting bolts: Bolt A- 7 x 1.00 Male Left Hand, Bolt B- 8 x 1.25 Male Left Hand, Bolt H- 10 x 1.25 Male Left Hand, Bolt E- 8 x 1.25 Female Left Hand, 10 x 1.00 Female Left Hand, Bolt I- 10 x 1.25 Female Left Hand, and Bolt O- 3/8 x 24 Female Right Hand. Click on the More Info Icon to see if this trimmer head fits your trimmer model. Repair parts available for this trimmer head are available below.