Very good product. Particularly useful in cases where it is not possible to hold the screw with the other hand when unscrewing. It sits firmly on the blade without slipping, strong magnet. You can place it either close to the edge to directly catch the screw or higher up to magnetize the entire blade effectively. Necessary when you want to screw the screw into a place that only gives you one hand and you essentially want the screw stuck on the screwdriver (!unless you have the wera ph2/pz2 tips that grip the screws without a magnet, without anything!)