Ryobi&nbsp;Expand-It ZR15518 Edger Attachment For String Trimmers&nbsp;(Certified Refurbished) This Certified Refurbished product is tested & certified by Ryobi to work like-new but may have scuffs, scrapes and dirt. The product includes all original accessories, and is backed by a 1 Year warranty. Attachment only, power base sold separately. Oversized adjustable knob for quick and easy height adjustment Large rubber flap shields against debris Requires no tools or adaptors