Original solid brass Master lock® Key blanks are cut to match your Master Lock®.  K1 Original Solid Brass Key blanks by Master Lock® can be used for the following lock models:

1, 2, 3, 4, 5, 6 and all their variable shackle lengths.

K22 Original  Key blanks by Master Lock® can be used for with the Model No. 22   1-1/2in (38mm) Wide Laminated Steel Warded Padlock

K500 Original key blanks by Master Lock® can be used for with the center Model No. 5001-3/4in (44mm) Wide Laminated Steel Warded Padllock