Assists Watershed Back Into Shower Perfect for Flat or Out-Sloping Curbs These CRL Shower Door Thresholds are mounted directly below the shower door to let the water drain back into the shower stall. Ideal for flat or out-sloping curbs. The rounded low contour of the Half Round Threshold will not harm feet. The Tapered Style Sill leaves a minimal sightline from the exterior of the shower. These thresholds may be used in conjunction with a bottom sweep. Use Mildew Resistant Silicone Sealant to adhere to curb of shower stall. Color: White Length: 31 in Width: 13/16 in