For use with the EGO 15 in. POWERLOAD String Trimmer - ST1520 and ST1520S. This is the Bump Head replacement part. The number 1 customer complaint with any string trimmer is line replacement. EGO has taken this pain point away with the World¿s 1st EGO POWERLOAD trimmer head. Rewind your line faster, simply insert the line into the head and press the POWERLOAD button. The 15 in. cutting swath, bump-head line advancement and professional-grade 0.095 in. cutting line make this tool truly professional grade. EGO parts are designed specifically for your EGO POWER+ products and offer the highest quality, performance and value.