Finger Press - GripFAQ.com

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Assist the thumb with slight pressure from the off hand.

The strength needed to break a weight off the ground is greater than the strength needed to hold it or control its decent. The finger press is a technique to take advantage of this fact. When training a pinch lift with one hand, apply slight pressure on the thumb side of the equipment to assist in raising a heavier than normal load. Then remove the off hand, allowing for a timed hold or negative.
In addition to training the grip, this tool is helpful for overcoming mental blocks with a specific weight. Once the mind knows a weight can be controlled, breaking it off the ground becomes much easier. Also consider using the finger press on fixed size thick dumbbells. Slight pressure applied to the head of the weight will stop rotation and enable a stronger pull.