Gator speed load cutting system trimmer head, fits most straight shaft trimmers, patented disc load system eliminates frustration of loading line into trimmer heads, line can be loaded in 20 seconds & lasts up to twice as long as standard trimmer lines, self contained with no parts to lose comes complete with adaptors to fit many brands using 7 mm lhm, 10 nm x 1.0 lhf, 8 mm x 1.25 lhm/f & 10 mm x 1.25 lhm/f, will not fit bolens, troy bilt or homelite straight shaft trimmers.