... size, which make the Screw Supplier stable and easy to use. Features:Models: 514, 517, 520, 523, 526, 530, 5401,Small ... , exquisite, easy to operate;2,High work efficiency, 4 times faster than the circular type;3,Special detecting circuit, energy saving ... .3 Φ2.6 Φ3.0Φ4.0 Stable and Easy Use Automatic Screw supplier