3-7/8" Brushed Nickel shower strainer for use with a 4 in. square drain top. Specifications: Color:Chrome Material: stainless steel Outer diameter: 4 inch Screw Holes Center to Center Measures: 3-3/8" (86mm) Cap thickness: 3 mm/ 0.12 inch Package includes: 1x Square shower drain covers This floor dariner cover is Screw-in Type , NOT SNAP-IN TYPE,And,Pls Measure before Purchase (Outer and Inner Diameter ) Warm notes: Take your old drain/grate off and Replacement cover in. tighten a screw until our drain grate fits snugly. That’s it! Please do not use plumber's putty for installation. *We recommend not using bleach as a cleaner on the drain grate, as it could slightly lighten the finish.*