I had hard time with applying tension to some locks when practicing lockpicking. Since I'm using top of the key way tension, some lock were very uncomfortable to hold in the hand and tension it in the same time. It depends on particular key way.
Some lockpickers solve this problem by bending tension wrench. Unfortunately, tension wrenches are fairly expensive and angled one is not ideal to carry in the case with other picks.
This thing should simple provide little offset between tension wrench and your finger, so it should be more comfortable to hold in your hand.
Tension wrench is held by two 4*5 mm magnets.
Designed for Multipick ELITE TOK tension wrenches https://shop.multipick.com/en/lockpick-tension-wrenches/top-of-keyway/multipick-elite-TOK-tension-set-2-7-pcs-a-case
The author hasn't provided the model origin yet.