DOP55-994HL Homelite Trimmer Head DA-03001-A. This is an origianal aftermarket trimmer head that fits trimmers with a 3/8 " OD shaft with a 5/16-18 thread. Fits trimmer models ST155, ST165, ST175 and ST2852 Duel Line bump heads. Trimmer line is not included. Replaces Oregon part number 55-053.