There are three primary types: Wire Loop, Hook-style, and Automatic Desktop threaders. Wire loop threaders are the most cost-effective and popular for household sewing kits, but you must ensure the wire is securely crimped or glued to the handle to prevent pulling out. Hook-style threaders are better for heavy-duty needles and thicker yarns. For the elderly or vision-impaired demographic, Automatic Desktop threaders (like the 'bird' or 'desk' style) command a higher retail price and offer superior ergonomic value.