chain ring gauge is 2.5mm 1 set= 1 steel chain+1 elastic band(the chastity cage on profile picture is not included,the plier tools is not included) steel chain length is 1.5meter/59inch,this length can fit all people,and of course it must be longer than what you need exactly,so you need to cut it by yourself,or you leave a note to tell me cut the appropriate proper length for you(this length must can’t be shorter than what you need exactly) If your chastity cage always falling down and the base ring feels like a little loose,then this set can improve your chastity cage wearing experience. For the usage,you can take my first profile picture for reference. Don’t leave in a hurry,Take a look at the chastity cages in this shop. https://www.bonanza.com/booths/cesbondage?item_sort_options[custom_category_id]=861901