Box pattern trap flanges 1.Material:Stainless steel 2.Inner diameter: 38mm 3.Outer diameter: 77mm 4.Fit for 38mm arm flange Box pattern trap flanges1.Used with faucet mixer shower arm,wall mounted spout,basin trap.2.Different designs are available .3.OEM orders are acceptable.4.We would assure you that excellent finish, best services, reasonable price, on-time delivery.