This Bernina Needle Clamp Screwdriver is designed to fit the Bernina 7 series machines. It fits into the needle clamp release screw perfectly making it to loosen the screw to remove the needle. Use this screwdriver to tighten the screw back up to hold your needle in the clamp firmly. This is the original Bernina torx 10 screwdriver so it will fit perfect into your accessory box. It is also small so it will help to prevent from over tightening the needle clamp screw which can cause damage. Buying original Bernina parts for your machine will help your machine to preform its best for years.