steel hinge
material: iron
szie: 4*3*3.0-4BB
         4*3*2.5-4BB
          4*3*2.3-4BB

3*2.5-2.5-2BB

5*3*2.5-4BB
5*3*3.0-4BB
5*3*4.0-4BB
packing:   50pr/ctn   box or blister

valid finish:  GP, PB. AB, AC. SN CP. PN , BS.