The 3-in-1 mower deck has a durable base with 4 wheels that secures to a 12" Black & Decker String Trimmer/Edger. Foot pedal release allows for quick insertion and removal of deck to mow, trim, or edge. 2 level height adjustment. Compatible with cordless trimmers Model No. NST2118 (SKU 760162), LST300, and LST400 (SKU 705287).