1.Double functions: for threading, it can help pass thread through the needle eye conveniently, in case of poor eyes or poor lighting;For inserting, it holds needles firmly to prevent falling while changing needles2. How to use: for threading, firstly, insert the thread into the V-groove of threader;Secondly, place the V-groove over the needle just above the needle eye;Thirdly, slide the threader down the needle while pushing it gently until the threader pin goes into the needle eye3. Durable material: this set of needle threading tools is made of quality plastic and metal, durable material, not easy to break, can serve for a long time4. Wide range of usage: it is suitable for all kinds of household multifunctional sewing machines without automatic threading, meanwhile, some old sewing machines can also use it5. Common dimension: the sewing needle inserters are approx.7.5 cm/ 3 inches in length and 1 cm/ 0.4 inch in diameter, common size, easy and convenient for handling