Diamond Fishing Products Xtra-Hard Wind-On Monofilament Leader - Diamond’s high strength monofilament and fluorocarbon combined with a low stretch dyneema loop creates the strongest, most dependable wind-on leader in the world. Diamond’s Wind-On leaders are attached with a loop to loop connection to your fishing line. The wind-on system improves bait presentation, eliminates the need for conventional long leaders and provides safer handling and releasing of fish at the boat.