CORELINK Splice, Multimode (62.5 and 50/125µm) 12 Pack It is now possible to make a reliable low loss fiber optic splice in about 30 seconds! The CORELINK splice utilizes a mechanical clamping mechanism activated with a simple key. This system provides an average splice loss of .15 db. Two models are available for multimode and singlemode with 125 um fiber. Sold in packages of 12 with 2 keys included.