Duogalia 100-Pack SC/APC Fiber Optic Coupler Keystone Jack SinglemodeThis package contains 100 SC/APC singlemode fiber optic coupler keystone jacks for patch panels and wall plates. The couplers connect two SC/APC-SC/APC fiber patch cords together. They feature high-density zirconia ceramic ferrules that are heat-resistant and acid-resistant. Performance specs include insertion loss of 0.2dB or less and return loss of 50dB or greater, with repeatability tested to 1000 poundsProductdimensions5.9 x 3.4 x 8.9