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 2 - Occasionally damp/wet, rural and sheltered areas 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 Zinc Hole Dia. mm 6.30 Knuckle Dia. mm 7.7 Knuckle Type Plain Length inch 1 Length mm 38 Material Steel Open Width mm 87 Pack Dimensions L x W x H mm 170 x 92 x 10 Pack Weight kg 0.100 Pattern 404 Product Code 434715 Rec Screw Dia. mm 4.0 Rec Screw Gauge imp. 8 Screws Required Per Pair 12 Size L x W mm 38 x 87 Thickness mm 1.5