Pivotrim Hybrid Trimmer Head For (Stens 385-893)Pivot rim Hybrid Trimmer Head Pivot rim Hybrid Trimmer Head Fits Models: Universal Most gas, straight and curved shaft trimmers Specifications: Arbor Size s: M8 x 1.25 LH x 22 mm stamped #1 screw, M10 x 1.25 LH x 21 mm stamped #2 screw, M7 x 1.00 LH x 22 mm stamped #3 screw, M8 x 1.25 RH x 22 mm stamped #4 screw, 5/16"-18 UNC RH x 19 mm stamped #5 screw, M8 x 1.25 RH stamped A nut, M10 x 1.25 LH stamped B nut, M10 x 1.00 LH stamped C nut, 3/8"-24 UNF-2B RH stamped D nut, 5/16"-24 UNF-2B RH stamped E nut, M10 x 1.50 LH stamped F nut, M8 x 1.25 RH stamped J nut, 3/8"-24 UNF-2B LH stamped K nut Easily switch from line to blades, do not use lines and blades together Easy installation Fits 99% of gas powered straight and curved shaft trimmers; not battery or electric Heavy-duty blades for heavy grass and light brush Includes 6 lines and 3 blades Less stopping to change line Quick and easy line loading that prevents broken lines Up to 6 cutting edges Uses .095 Diameter line