Fixed straight handle that is 7 inches long for our Gen2 series pole mount kits; which use a 3/4" down shaft to deploy the transducer.
 
This handle is extendable in length and you may get further shaft links here as desired:
 
6 inch / 12 inch / 20 inch
 
Also for a nice finishing cosmetic touch you may want to add a nice aluminum cap at the end of the handle shaft - here:
 
https://www.fishfindermounts.com/product-page/gen3-button-cap-for-shaft-links