The 10 pcs M10x1.25 left hand thread collar nut is the perfect solution for replacement of universal blade nuts used in string trimmer, brush cutter, and gear head accessories. These nuts ensure consistent engagement and secure attachment of blades, ensuring efficient operation and preventing accidents associated with loose or missing parts. Their universal design allows for compatibility with a wide range of tools, making them a versatile addition to any DIYer's or professional's tool kit. With our guarantee of high-quality materials and craftsmanship, you can trust that these nuts will provide years of reliable service.