OXO Good Grips Jar Opener with Base Pad

From the producer

Jar Opener base pad retains jar in place, decreasing drive required to open jar
Sharp, stainless-steel tooth grip jar
Place it underneath the jar, slide the Jar Opener over the lid and twist counter-clockwise to loosen.
Contoured, non-slip grip for higher leverage
Jar Opener is dishwasher secure, hand wash base pad