Good Tool Kit: The universal nut kit is a good tool kit for finer trimmers. Nut kit UNIVERSAL NUT: The universal mower drive nut kit fits most lawnmowers with six tine heads. Easy to Install: The brush cutter blade attaches to the rotary head with this mounting kit. Material: Made of high quality metal, durable and long lasting use. Fits most lawn mowers, trimmers and brush cutters.