Wera 05073403001 premium plus star magnetiser demagnetiser wera 05073403001 this indispensable aid from wera can be used on any screwdriver simply run the tool down the positive side of the wera star and the tool becomes magnetised and can hold screws securely on the blade to demagnetise simply run the tool down one of the negative sides wera 05073403001 premium plus star magnetiser demagnetiser