600ET-BCP OSB 600 Series 1-1/2 in ABS Hub - Brass Chrome Plated Works with our Island Tub Drain™ Freestanding Tub Testable Rough-in*Brass coarse thread Strainer with 5/16-18 UNC thread-in Crossbar (accepts most drain mechanisms)Strainer features integral Overflow Holes and unique vertical Weeping Channels (prevents buildup at Overflow Holes)