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.