WW Pivotrim X2 The pivotrim x2 replacement trimmer head allows for less stops to change line and works with most gas curved shaft and straight shaft trimmers Universal fit for 99 percent of all gas curved and straight shaft trimmers Pivoting action prevents line breakage and downtime changing line Quick and easy line loads Cuts with 4 pivoting lines This is a Weed Warrior replacement part Part Number 16961 This is an aftermarket of generic part