This Push Button switch Exquisite workmanship ,Quality assurance for 3 years.If there are quality problems within 3 years, you can send us email. We will send you new ones . Product Name: Push Button Switch Station; Country of Manufacture: CHINA; Material: Plastic, Metal Contact Type: 1 NO, 1 NC; Action Type: Self Locking . Net Weight: 170g; Package Content: 1 x Push Button Station; Box Size: 7.8x7x6.6cm / 3.1x2.7x2.5Inch (L*W*T) Button Size: 4 x 2.5cm / 1.57 x 1 Inch (D * H); Mounting Screw Hole Diameter: 5mm / 0.19 Inch Ui: 440V; Ith: 10A Push Button Control Box designed with a red mushroom push button switch, self locking mushroom head, 1 NC 1 NO contact type, 4 screw terminals. it complies with the standard of IEC337. Push Button Station is widely used in industrial automatic system for controlling machines. If there are quality problems within 3 years, you can send us email. We will send you new ones .