SIZES: 2g, 3g, 4g, 5g, 6g, 8g These floats are designed for fishing with a DH In-Line olivette around two to three feet from the hook and one or two droppers, either No4 or No6 shot, below. The tip diameter of this float is critical in my opinion and you will notice that the diameters get progressively thicker as the floats get bigger. To help choose the right size of float, as a general guide, use 1g for every two feet of water. A fast flowing eight foot deep swim therefore requires a 4g float.