In what material are the stainless steel latchlocks you have made?

Most components are made from 1.4301 which is V2A quality

The stainless steel latches of the MLLA Series are made of 1.4301 and 1.4567.

The stainless steel strikes of the MLLA Series are made of 1.4301

Here is a table with each part of the MLLA latch specifically:

 MLLA Latch:

Base plate 1.4301
Handle 1.4301
T-Nut 1.4301
Drawhook 1.4567
Pin 1.4301
Rivets 1.4567
 

MLLA Strike:

1.4301