1.Product Name : ST female to ST female Fiber Coupler Flange Connector;External Material : Plastic, Metal 2.Compatible with Fit Cable Dimension: 3mm/ 0.118",Mounting Hole Dimension: 5mm/0.2" 3.Can be used with 2 ST single-mode or multi-mode fiber optic jumper cables,Connect two Simplex ST/ST patch cords together or use in an ST patch panel 4.This ST Fiber Connector is designed with heavy use in mind and all products meet UL, cUL, IEC & RoHS standards. 5.Package: 20 x Fiber Optic Coupler Flange