Ref. : FBLS.02.BH.17 / FBLS.02.BH.22 / FBLS.02.BH.23 / FBLS.02.BH.24 / FBLS.02.BH.25 FBLS.02.BH.26S The peculiarity of FBLS.01. BH.22 is in the closure device. The FBLS.01. BH.23 is with simplified construction. It can engage two lengths and is designed for chains. Here is a clasp with original construction - FBLS.01. BH.24. Patented in the 30s the spring effect is installed on the bottom of the box. In the operation of FBLS.01.BH.25 to disengage theblade two movements are required, which ensures safety. The FBLS.01.BH.26S is with double locking blade and safety in the pusher. This is the profile of the blade-box-push assembly that provides security.