This open-mouth gag will turn your partnerft.s face into a masturbator. Tighten the straps around their head and secure them with the locking buckle. The hard interior ring of the gag will keep their lips and teeth pried open. Interior gag diameter is 1.75 in., 1 in. insertable. Straps adjust up to 26.5 in. circumference. Does not include lock.