This suction lock handle has been designed to be used with silicone toys, to give you the ease of holding the toy. You will find a M8 threaded hole at the base of the handle. 

Designed for approximately 7-5.5mm diameter hole in Silicone toys.

Softer toys will generally have a smaller hole as the silicone has a higher elasticity and there for needs the smaller size hole to hold on to the lock.