Husqvarna RA-V Reciprocator Gear Box AssemblyDesigned for safer and more efficient weed control and grass edging along footpaths and on gravel paths, where an ordinary trimmer would cause the risk of throwing rocks and debris. The robust, durable reciprocating blades work back and forth to cut the weed like a scissor, similar to a hedge trimmer. This assembly easily allows for conversion of existing straight shaft trimmers to dedicated Reciprocator machines. Can be used with Husqvarna Trimmer