25LB45-Q - 

Grayhill 25L Series Mechanical Encoders
The 25L series has a life expectancy of 100,000 cycles making them extremely cost effective to similar designs. They have also been manufactured to ISO 9001 standards. All standard switches are continuous rotation and there is a wide selection available depending on the required amount of positions. They have been designed for panel mounting and feature high quality gold plate over nickel copper contacts.