AIM:  to learn about different types of hinge joints

  1.  Parliament hinge:  this is used for big doors
  2.   hinge this is used for heavy dose
  3.  strip hinge this is used for following doors
  4.  piano hinge this is used for big doors

 screw types :  1)  height of screen

                         2)   clip top screw

    3)square tops group

    4) flat top screw