- Size: Approx 8 * 3* 1(L*W*H) - Fit for 15-17mm Electrode tip - Color: Shown within the images - Material: Plastic & Metal - The key can be taken down when there isn't any energy connection - In this way, power supply are not viciously switched on Contact resistance: 50MInsulation resistance: 100MDielectric strength: 1500VAC / 1minElectrical life: 10000