Feature: Perfect fit on Addi Express (22 needles) and Addi Express King Size (46 needles)Made of high quality plastic, without smell, safe, solid and durable for your use. Need a standard ¼” hex steel bit to fix the position, hold it at 90 degrees. Specification: Color: Black Material：Plastic Package: 2x Crank Adapter 2x ¼” Hex Steel Bit) Warming Tips: - Please do not use power drills or any screwdriver that exceeds 4V. - Please do not use high RPM drills as it may damage the adapter. - Please do not use your power adapter at moderate speed (maximum 180rpm) -Note: It will be a little tight when the first time you use it, Please don’t worry. You need to use a little bit of strength to screw it in, make it fit your machine. It will be perfect after a few times of use.