BA-30 Lock Mechanism:yellow lock cylinder as picture shown you don’t need to think

you don’t need to think about the locking ring thickness (actually it is 7mm thickness so it will occupy 7mm length) you only need to offer the length you need

Make sure the key option you order would be matched to your cage's lock

Hook Gauge option:2mm

please remember to remind us your metal cage dimensions is based on your resin test cage

BA-30 Lock Mechanism:yellow lock cylinder as picture shown you don’t need to thinkMaterial: Stainless Steel Titanium The below sizes are must needed for custom: 1. Cage Tube Overall Length 2. Penis Tube Inner Diameter 3. PA Gauge(if you need 2 different gauge PA hook,select "with 2 different sizes PA hook" to place order) 4. PA Depth For other size details or style details,specify in the textbox when place order. (1cm=10mm=0. 4inch)