Steel backflap hinges are ideal for a wide variety of applications where a hinge is required be screwed to the face of the door, commonly when the door material is too thin for butt hinges. Corner Type Square Corrosion Rating 1 - Clean, dry & low humidity environments Description Steel backflap hinges are ideal for a wide variety of applications where a hinge is required be screwed to the face of the door, commonly when the door material is too thin for butt hinges. Finish Self Colour Hole Dia. mm 3.90 Knuckle Dia. mm 6.6 Knuckle Type Plain Length inch 1 Length mm 25 Material Steel Open Width mm 74 Pack Dimensions L x W x H mm 170 x 92 x 10 Pack Weight kg 0.060 Pattern 404 Product Code 434328 Rec Screw Dia. mm 3.5 Rec Screw Gauge imp. 6 Screws Required Per Pair 12 Size L x W mm 25 x 74 Thickness mm 1.5