①. Compatibility: compatible with Bosch trimmer grass trimmer ART 30-36LI, AdvancedGrassCut36, ART 24, ART 27, ART 30, ART 24+, ART 27+, ART 30+, (models 2016 Onwards), replacement thread spool (F016800351), trimmer spool cover (16000). A000X601/1600A00DU0/F016L72438) ②. Efficiency: The coil design reduces air resistance and cuts more efficiently, so you can reach the hard-to-reach edges of your garden lawn. The aerodynamic shape allows the wire to stretch and absorb shock on hard surfaces, providing less resistance for more efficient cuts. ③. Time saving: the automatic replacement of the coil feed system simplifies the tedious work of manually winding spools. Quick and easy replacement without tools. The 20 ft long trim line offers gardeners more space to trim. ④. Package size: you will receive 4 replacement spools, with 1 trimmer spool cover, which fit perfectly into the thread holes. Portable 1.65mm for fast cutting.