Nite ize s biner microlock twin pack product description the s biner microlock is the perfect size to hold and organize keys to rings or for organizing other smaller items and now with its added twist lever it also locks perfectly preventing any unintended or accidental openings made of high quality stainless steel the s biner microlock features a center lever made of durable plastic a simple twist effectively and securely locks the gates and keeps them that way until you twist it open ag