Replacement spool cap designed for use with trimmers. (Spring not required for cordless trimmers.)</br>Automatic feed spool</br>Measures 3.5-by-1.5-by-3.5 inches; weighs 1.6 ounces</br>Compatible with AFS models GH400?? GH500?? GH600?? CST1000?? CST2000?? NST2018?? ST7000?? ST6600?? and ST7700</br></br>Product Description</br></br>The BLACK+DECKER Replacement Spool Cap and Spring is designed for use with string trimmers that utilize an automatic feed spool. This product fits BLACK+DECKER AFS models GH400?? GH500?? GH600?? CST1000?? CST2000?? NST2018?? ST7000?? ST6600?? and ST7700.</br></br>Amazon.com</br></br>The Black & Decker Replacement Spool Cap and Spring is designed for use with string trimmers that utilize an automatic feed spool. This product fits Black & Decker AFS models GH400?? GH500?? GH600?? CST1000?? CST2000?? NST2018?? ST7000?? ST6600?? and ST7700.</br><br/>http://www.amazon.com/gp/product/B000H5R722