Snap fastening clips for use with most vertical blinds and roller chains. Easy to attach with fingers or flat pliers. 
Can be used to connect broken chains on vertical blinds and roller chains. 
Use as stopper to prevent roller chains continuously rolling through the clutch mechanism. Fits most standard ball chain with ball size up to 4.5mm 
Use when shortening lengths of roller chain for added safety in the home, especially if you have small children. Simply cut the roller chain to a length not accessible to children and reconnect the ends ‘ball to ball’ with this handy little clip.