Westbrass 1-1/2" NPSM (1-7/8"-11.5 UNC-2A) Coarse Thread Twist & Close Bath Drain Plug, Chrome, 79438CP-Z Lift and twist the stopper knob to let water drain, or twist and push down to restrict 1-1/2 in. NPSM (1-7/8 in. - 11-1/2 UNC) coarse thread body exterior Fits coarse thread tub drain shoe Classic and versatile polished chrome finish Brass and heavy-duty metal construction Polished Brass Polished Nickel Satin Nickel Oil Rubbed Bronze Stainless Steel Polished Chrome White Matte Black Antique Copper