M16 screws are the most widely used screws in the current sex doll industry. It is compatible with a series of brands such as WMDoll, Real Girl, Irontechdoll, etc., making it a versatile choice for users. Manufacturers consider interchangeable heads when producing dolls, designing interchangeable heads for customization and versatility in appearance. Currently, there are three types of M16 bolts: standard double thread bolt, single thread bolt, and multi-angle rotating link screw. https://www.dachiwife.com