Straight Tip (aka bayonet) connectors have been around for some time in the fiber world, and not without reason. The push-on and twist connection style offers stability rarely matched in other connectors, and with its metal body you needn't worry about damage to the ST. The single-mode fiber offered here is duplex formatted, meaning this cable houses two individual fibers, each running data in opposite directions and allowing for simultaneous bi-directional transmission. Further, the zipcord cable jacketing is a tangle free solution for your cable run and makes for neat and clean applications. Try the ST to ST, your connection won't be going anywhere.