20 Amp Self Test SmartlockPro Combo Duplex Guide Light and Tamper Resistant GFCI Outlet, White Glossy White Tile Specification Details Series Name Geo Power That Organizes Your Specification Details Series Name Geo Collection Manufacturer Color Finish Master Knot Black Satin Color Finish Family Gray Color Shade Dark Tile Size 20 in x 20 in Actual Length (Inches) 20 Actual Width (Inches) 20 Actual Thickness (Millimeters) 5 Thickness Measurement 5 mm Wear Layer Thickness (Mils) 0 Made from heat treated zinc coated steel with coarse threads for strong holds and corrosion resistance the device allows for fast and easy installation Our complete line of self test GFCIs periodically conduct an automatic internal test to confirm that it can respond to a ground fault