Colvern CLR4239 Series Wirewound Precision Potentiometer
1/4" Diameter shaft
38mm length from the mounting face
Enclosed body with sealed terminals and panel sealed
38mm diameter body
Good torque
These are great pots only available in 1K but a special, with nickel silver cap. Very nice!
 
NOW AVAILABLE 2 Only 5K Linear
 
Specifications for this product can be found here.