Premier Copper Products D-209ORB 1.5-Inch Overflow Pop-Up Bathroom Sink Drain, Oil Rubbed Bronze Overflow push pop top down pipe width: 1.25-Inch Upper flange dimensions: 2-Inch, push pop with cap dimensions: 2.5-Inch, drain length: 8.5-Inch It can be installed by compression Drain size is 1.5-Inch It is made of brass