QM Square Shower Drain, Base and Grate made of 100% Stainless Steel Marine 316, Delmar Series Delta Line, Satin Finish, 4 inch, Kit includes Hair Trap/Strainer and Key Base and Grate are made of 100% stainless Steel Marine 316. Offers the longest life span in the market and also the most corrosion resistance from water softener and cleaning chemicals. QM drain base thread into most common 2" ABS, PVC or Cast Iron drain Flange. Flange is Sold Separately* Hair strainer basket comes with every QM drain, strainer fits inside the drain to collect hair and other debris, preventing pipe clogs. Also, keeps insect and small rodents from coming up thru the sewerage system. Empty basket as needed to maintain optimal performance. The use of the basket is optional Lifting key is included to assist with grate removal Drain frame prevents damage the grout when the grate is removed