The genuine Oregon 24225 Gator SpeedLoad Trimmer Head is engineered for brush cutters with engines greater than 25cc and long shafts. This innovative trimmer head provides the fastest and easiest line loading experience on the market, eliminating winding, spools, and tangles. Users simply insert the line discs to operate. It is designed to fit most straight shaft trimmers and brush cutters, and includes necessary adapters. Compatible with Oregon Gator SpeedLoad line discs in diameters of 2.0mm, 2.4mm, 3.0mm, 3.3mm, and 4.0mm. A 2.0mm line disc is included.