The Series 20 Short Catch Overshot consists of a Top Sub, Bowl, Basket Grapple, and Basket Grapple Control. They are designed to eliminate the usual Guide, allowing the Grapple to be placed at the very bottom of the tool.
No spiral parts are used. A Basket Grapple being used in all cases.
The Series 20 Overshot is the same as the Series 70, except the Basket Grapple Control. They are all the same size but made in a half circle, and locked in place with the Top Sub.
These overshots are operated and released the same as the Series 150.