This is my absolute favourite needle threader - it's sturdy (I've yet to break one!), simple to use and plastic free.
 
The finer end is suitable for needles with a medium size eye and the larger end for needles such as tapestry and chenille needles with a much bigger eye. 
 
Ideal for use with a wide variety of thread and yarn e.g. Sashiko thread, perle cotton, embroidery floss and fine darning yarn.
 
Insert one of the hook ends through the eye of the needle, lay your thread/yarn over the hook, then pull the threader through the needle's eye and you're done. 
 
Made in China from high quality steel- sadly I have been unable to source these from a local manufacturer but I'm always on the hunt!!