Trimmer head features quick and hassle free line loading. No need to mess with difficult to load trimmer heads that get tangled easily. Just insert line and go. Two line head. Contains 7, 8, 10mm studs. 10mm x 1.24 left hand, 10mm x 1.00 left hand, 12mm x 1.75 left hand, 3/8" x 24 right hand, and 5/16 x 24 right hand nut.