High quality The micro screw is made of stainless steel, the nut and the convex washer are made of silicone and the box is made of plastic. High quality for durable use.With storage box This screw set comes with a storage box for convenient storage. You can easily find the desired screw in the storage box, it will not get lost Screw size 1.0x3.6, 2.0x1.4x2.4, 2.0x1.4x2.6, 2.0x1.4x2.8, 2.0x1.4x3.0, 2.0x1.4x3.2. 2.0 X 1.4x3.4, 2.0x1.4x3.6, 2.0x1.4x3.8, 2.5x1.6x4.0, 2.5x1.6x4.5, 2.5x1.4x6.0, 2.5x1.4x8.0Easy to use With elbow tweezers, you can pick up or store screws well , It will be a good helper for you to repair.Widely used Can be used for glasses, sunglasses, watches, watches. A practical accessory for your toolkit.