As Seen On TV, Pivotrim Trimmer Head, Keeps Your Trimmer Line From Breaking, Powerful, Patented Pivoting Head Pivots & Protects By Absorbing Shock, Reducing Wear & Tear & Minimizing Bending & Breaking, Lines Last Up To 20 Times Longer For Fewer Stops & Quicker Jobs, Ideal For Clearing Fields, Edging Sidewalks, Driveways & Trimming Around Chain Link Fences Without Breaking A Line, Easy To Load & Install, Fits All Gas Trimmers, Accepts Standard .095″ Or .08″ Line, Includes Unit 4.5″W x 2″H & 4 Pre-Cut Trimmer Lines.