Disc Detainer Pick
A Disc-detainer is a lock design that uses rotating discs as locking components. In most designs the discs interface with a sidebar when properly rotated to allow them to actuate the locking bolt.
Disc-detainers are primarily associated with Abloy locks, ABUS and Kryptonite there are loads of chinese knock off''s that far inferier to the real macoy ABLOY
Disc Detainer Locks that are increasing in popularity & are a fun pick