Cherry Keeper Custom - CKC-U1QPGH-2080.7mm total length (86mm with a double ring), 37mm head inside diameter, 37mm head length, 34mm shaft inside diameter. HeadLock 31mm. Remove 4 & 8 o'clock bars from head of cage (lower side).HeadLockThe HeadLock feature adds a smaller ring to the entrance to the cage, restricting the opening in such a fashion as to hold the head in place when properly sized.  The HeadLock ring will also put an end to casual pull-out attempts if a sufficiently large HeadLock size is chosen.  No device of this style is 100% secure, but HeadLock makes it so that a serious effort must be put in to escape.Product DetailsTotal Length: 80.7mmHead inside diameter: 37mmHead depth in front of HeadLock: 37mmHeadLock: 31mmShaft inside diameter: 34mmRing to Cage Gap: 8mmBar Profile: Circular, 5mm diameterLocking Mechanism: Utilizes a standard chastity lock cylinder (Not included)Ball Gap: (To standard ergonomic rings +/- 0.2mm) 36mm ring: 11.2mm 38mm ring: 11.6mm 40mm ring: 12.3mm 42mm ring: 13.2mm 44mm ring: 14.4mm 46mm ring: 15.8mm 48mm ring: 17.4mm 50mm ring: 19.1mm 52mm ring: 21mm Add-On CompatibilityBullet Vibe: NoUnicorn: YesCage renders And diagrams may be shown with a compatible Cherry Keeper Ring and/or brass lock, which are not included.  Rings and locks are sold separately.This cage is only compatible with Cherry Keeper Rings.   It is NOT compatible with New Fun rings or rings from other devices. Description version v20200502 updated on 8/6/2020 4:28:09 PM