US $22.12 FRRK Cock Cages Durable Stainless Steel Chastity Devices Male Stainless Steel Chastity Device Penis Cock Cage Urethral Tube Lock Store Home Products Feedback. Material: Top Quality 304 Stainless Steel The device comes with a single ring size to choose from, ranging from 38mm to 57mm. The total length of the Stainless Steel Male Cock Cage is 25 mm, and the inner diameter of the cage is 32 mm. But, seriously, there's more you need to know about this chastity device. Give your master complete control to his or her satisfaction as you kneel and beg for release. For urination, the cage has a 25. 5mm opening at the top. Smooth, durable and of guaranteed quality. What are you waiting for? Come and try it!