... , SN, PC, SB, AB, AC,etc ;4)Keys: 5 computer keys or 3 normal keys with thickness of 2.0 or 2.2mm ... in high accuracy and QC. Lock body,lock core and keys,knobs, are all Processed by Highly accurate CNC machine ,and ... producing cylinders, it is about 150,000 pairs per month. standard door lock cylinder with double open