Westbrass 1-3/8" Fine Thread Bath Tub Drain Body (1-5/8"-16 UNC-2A), Polished Chrome, 792SOCP-F FINE-THREAD BODY - use with a fine-thread tub shoe (not included) 1-3/8" NPSM (measures 1-5/8" x 16 UNC-2A) exterior thread #10-24 thread for bee-hive strainer (not included) Brass contruction with polished chrome finish blends into your existing fixtures