Adapter size: 20ft 0.065" Line Diameter, compatible with original spools models RS-136 / RS-136-BKP / 143684-01, replaces cap model: 682378-02, replaces spring model: 68223500 Compatible Model: Black Decker weed eater string trimmer: CST500, CST800, GE600, ST1000, ST3000, ST4000, ST4050, ST5000, ST200, ST300, ST400 and ST6800 Replacement Parts: black decker st4500, for black decker st4500 parts, for black decker st4500 spool, for st4500 black and decker spool, for black and decker bump feed spool RS-136-bkp, RS-136 weed eater replacement spool, ST4500 replacement Spool, bump feed spool bkp RS-136, RS-136-bkp, RS-136 black and decker, RS-136 bump feed spool, RS-136 spool , RS-136 trimmer spool, for black and decker RS-136-bkp, for black and decker RS-136 High Quality Products: Made of premium nylon and ABS material flexible and elastic. These kind of materials can reduce drag and achieve fast cutting Package Included: We provide 4 Trimmer Spool + 1 Spool Cap Covers + 1 Spring, enough quantity to offer long-lasting use If you are not satisfied with our product, we accept all requests for returns, exchanges or refunds RS-136 Trimmer 20ft 0.065" Spool Line for Black Decker ST4500 ST1000 ST4000 CST800 ST6800 GE600 String Trimmer Weed Eater Replacement Line Auto-Feed Spool (4 Spool + 1 Caps + 1 Spring)