WW EZ Lock Head The EZ-Lock replacement trimmer head allows for less stops to change line and works with most gas curved shaft and straight shaft trimmers Quick and easy line loads eliminate the frustration of working with tangled spool Universal fit for 99 percent of all gas curved and straight shaft trimmers Quick and easy line loads Cuts with 4 lines This is a Weed Warrior replacement part Part Number 16741B This is an aftermarket of generic part