- IV Safety Winged Needle Sets have soft, flexible, interlocking wings that readily conform to body's contour. The needles are bonded to the wings at just under 3 degrees downward angle, for less risk of vessel damage or occlusion of the lumen. The coil-resistant tubing reduces recoil during use. They are available in a variety of sizes. This model is sized at 3/4 and includes a 12"" tube.