STERLING 72161100-0 36-Inch Shower Base Vikrell Center Drain, White Compression molded from Sterling's exclusive solid Vikrell material Tongue-and-groove modular design allows for easy snap together installation Reduced 3.5" step-over threshold height creates a safe entrance and exit for aging population Easy to install by one person No unattractive weep hole to tile around, unlike many pre-fabricated receptors