Cruciform key

BKS cruciform key (1950s)

A cross-bit key is a 70 to 130 mm long key with a round key shaft , a cruciform key bit and welded key grip (key head). Three or four ribs of the key bit are provided with key incisions (notches), from which the locking of the cross-bit key and the associated cross-bit security result.

Two different cruciform keys for the same lock