Material: Plastic/Metal. * Color: Black. * Package: 1 x Crank Adapter 1 x Hexagon Steel Drill Bit (Other accessories are not included). * Size6.5*6.5*2.5cm/2.56*2.56*0.98". Please attention: Due to manual measurement , there may be 0.1-0.5cm deviation exist,hope you can understand. * Features: 1. Only suitable for Sentro 22, Sentro 40, Sentro 48, Jamit and Quick Knit from Loops & Threads knitting machines. 2. Our adapter fits tightly to the crank of your knitting machine, easy to place and disassemble, let go of your hand. Very suitable for beginners to knit their own fashion accessories. 3. Please do not use high-speed drills, as it may damage the adapter. We still recommend that you use the power adapter at a medium speed (up to 180 rpm), as these knitting machines are designed for manual operation. 4. Please screw it on your crank with a little force to make it fit your knitting machine. * About color: There are slight difference between the picture and the real item caused by light brightness,hope you can understand.