Sold as Pair 94023 3.5 Inch Height 3.5 Inch Width Made from Steel Mount: Mortise Gauge: 0.126" (Thickness of Hinge Steel) 5 Knuckles 6 Screw holes 94024 4 Inch Height 4 Inch Width Made from Steel Mount: Mortise Gauge: 0.126" (Thickness of Hinge Steel) 5 Knuckles 8 Screw holes 94025 4.5 Inch Height 4.5 Inch Width Made from Steel Mount: Mortise Gauge: 0.126" (Thickness of Hinge Steel) 5 Knuckles 8 Screw holes 94033 3.5 Inch Height 3.5 Inch Width Made from Steel Mount: Mortise Gauge: 0.095" (Thickness of Hinge Steel) 5 Knuckles 6 Screw holes 94034 4 Inch Height 4 Inch Width Made from Steel Mount: Mortise Gauge: 0.126" (Thickness of Hinge Steel) 5 Knuckles 8 Screw holes