This is the narrow version of the classic Rolling Thumber!
Just like the classic, place your thumb on the roller side, and fingers on the plate side. Because the fingers have nothing to latch onto, the thumb becomes the primary factor for holding the lift.
The narrow nature of this version makes it great for athletes with smaller hands, or even those with larger hands looking to train their thumbs in a highly closed/bent position.
Comes in one variant which uses a roller diameter of 1.25" for a total pinch width of 1-5/8".
By default, the finish on the roller is kept to raw steel to support consistency in competitions and also to allow for natural seasoning.