Our night fishing Glow stick is 0.17” (Diameter) x 1.45” (Length), the same as 4.5 mm x 37 mm. They are perfect glow in the dark fishing floats for night fishing. Crumb the pellet in the tube put it on the float pole end and the parts under the water. This Light Stick shows your rod tip and float at night. The Fishing Light Stick provides a transparent tube to join between two sticks. Easy to position the night Light Stick between fishing rod and floats at night time.