STS-12xx – Short/long lever or with key head selector, 2 positions
STS-13xx – Selector head with 3 positions, fixed, by releasing, with key
Selector heads, dark type, with short lever or long lever or key.
Many types of heads for your needs: 2 or 3 positions, fixed positions, center release position from left/right. In the key models, the extraction of keys can be chosen according to application needs.