heavy duty commercial die-cast aluminum head Easy line changes universal mounting without adaptor Trimmer head, universal mounting without adaptor, centering bore for both 20-25.4mm.Can delivery with :4nylon whips of dia:2.4-3.3mm and length=300mm each/kit of adaptor whashers/reduction ring.Suggested for trimmers over 33cc Universal multi-line heads with 8 lines DL-1100