QualityParts From Oregon That you can depend on. Pro bump and feed heavy-duty trimmer head: 7 mm x 1.00 left hand male; 8 mm x 1.25 left hand male; 10 mm x 1.25 left hand female; Holds up to 40 feet of 0.095 line.; ; Oregon Equipment Parts 55-983 Trimmer Head Pro Bump Feed 2