TrimmerPlus GC720 Garden Cultivator Attachment with Four Premium Tines for Attachment Capable String Trimmers, Polesaws, and Powerheads DURABLE TINES: constructed with 4 heat-treated Steel tines with 8 blades Each to create the perfect garden bed. ADJUSTABLE TILLING WIDTH: equipped with adjustable tilling width up to 9 inches. Perfect for weeding in-between rows! POLY-GUARD: overlays tines to keep dirt, dust, and debris away from operator. WARRANTY: 2-year limited. Fits Attachment capable units from Troy-Bilt, Remington, Craftsman, Yard Machines, Yardman, Snapper, Bolens, Murray, Ryobi, Greenworks, Kobalt and most other major brands. Inner coupler tube diameter: 1.65-Inches. Drive shaft connector: Square shape, 1/5, female