duct corner 20 TDC/TDF,TDC-20/TDC-30/TDF-40,grooving and wothout grooving,TDC corner,duct clip. ... /min. It is divided into four types: T-20,T-30,T-35,T-40 with their corresponding duct corner T ... .5mma=123mm LT-30Duct comer3mma=105mm T-35DCDuct comer3mma=106mm BC-10Duct clip5mm : SBKJ-TDC-30/TDC-20//TDF flange machine