【Compatible with】Black and Decker ST4500 Trimmer Head Blade Compatible with Black Decker RS-136-BKP CST800 GE600 ST1000 ST200 ST300 ST3000 ST400 ST4000 ST4400 ST4500 ST5000 ST6800 String Trimmer 【Our Advantage】Black and Decker RS-136-bkp Polycarbonate Trimmer Blades with upgrade version,serrated edges more sharper and easy installation,trimmer head fixed dual blades don't worry about getting stuck during installation 【Noted】Avoid using Black Decker ST6800 trimmer head blade for edging, working alongside brick, chain, or wooden fencing 【Attention】Wear eye protection and long pants when using this product to avoid injury caused by spilled lines 【Package】You will get 10*Quickload Blades+8*Screw+1*Polycarbonate Bladed Trimmer Head+1*Wrench, Pls contact us first when you get some problem, we will offer you assistance asap RS-136 Trimmer Head Blade Compatible with Black Decker RS-136-BKP CST800 GE600 ST1000 ST200 ST300 ST3000 ST400 ST4000 ST4400 ST4500 ST5000 ST6800 String Trimmer (20 Pack)