From Ernie Ball:

The Ernie Ball Pegwinder Plus features an ultra-smooth ball bearing design for fast and easy string changes. Thanks to its universal peghead design and integrated bridge pin puller, the Pegwinder Plus is suitable for most electric and acoustic guitars and basses. Features also include a soft, comfortable grip and a non-abrasive peghead to prevent unwanted damage during string installation. This compact pegwinder fits easily in most cases or gig bags and makes a great addition to any musician’s tool kit.