uxcell Self Closing Double Action Concealed Door Spring Hinges 4" 2pcs Mounting Hole Diameter: 6mm/ 0.24"; Package Content: 2 x Double Action Spring Hinges, Install Parts Weight: 720g; Material: Stainless Steel Product Name: Double Action Spring Hinge; Mounting Hole Distance: 27mm/ 1.1", 78mm/ 3.1" Hinge Length(Axis not Included): 100mm/ 4"; Hinge Thickness: 1.2mm/ 0.05" Axis Size: 117 x 18mm/ 4.6" x 0.7"(L*D); Mounting Hole Spacing: 27mm/ 1.1", 78mm/ 3.1"