1.It made of iron. 2.it with 4 nylon ring 3.sell with screw 3.good quality ,cheap price

1.have two size 3" and 4"

2.3" is  3"*2.5"*2mm

3.4" is  4"*3"*2mm

4.the size is standard and thickness is exactly 2mm.

5.It can use any where you want.

high quality nylon iron hinge for aluminium or metal or wood window and door