The Atra Dierre Classic Decoder is a precision tool designed specifically for the Atra Dierre Classic Decoder double-bit lock system. It works manually through self-impressioning, allowing fast, non-destructive lock manipulation while enabling you to extract the lock’s code during the process.

The Atra Dierre Classic Decoder set includes two Soft Keys with movable pins and one tension tool. This dual-key setup greatly improves efficiency, especially in locks with four full rotations. First, use one Soft Key for the initial decoding turn, then switch to the second for the next turn. By this stage, the keys are already shaped and ready to handle the remaining rotations, allowing you to open the lock in much less time.

Another key advantage is easy maintenance. If a pin bends or breaks, simply unscrew the bolt at the base of the Soft Key and replace it — no special tools required.

Best of all, the decoder comes fully assembled and ready to use. You don’t need to rearrange pins. Just adjust the pin pressure using the bottom screw on the Soft Keys if needed.