perfect fit For Sentro 22, 40 and 48 as well as or any clone.This improved design will fit snugly onto the crank of your knitting machine and doesn’t require any modifications on your machine. It can be placed and removed easily, letting you use your machine manually or powered in no time. The standard ¼” steel hex bit will fit securely in any screw guns without the need of additional adapters.Manual to automatic, can work quickly, save time, Improve efficiencyIt will be a bit tight when used, please don't worry.You need to screw it in it, let it fit your machine.It's perfect after using it.Our power adapter for quick knitting will help you to knit projects faster.1 PC Knitting Machine Special AdapterStandard ¼” hex steel bit fits securely in any standard power/electric screwdriverSize: 8.3×6.5cm/3.3×2.5''Description: Material: Plastic, iron