Adapter size: 16ft 0.065" Line Diameter Compatible Model: Hyper Tough 20V Max Weed Eater Spool HT-19-401-003-06, HT-19-401-003-07, HT21-401-003-02, HT21-401-003-03, HT22-401-03-05 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, enough quantity to offer long-lasting use If you are not satisfied with our product, we accept all requests for returns, exchanges or refunds HT-19-401-003-06 Trimmer Spool for 16ft 0.065" Weed String Compatible with Hyper Tough 20V Max Weed Eater Spool HT-19-401-003-06 & HT-19-401-003-07 (4 Spools + 1 Caps)