Farpoint Universal Binocular Mount 5 Pound CounterweightThe Farpoint UBM 5 Pound Counterweight is an additional balance weight for the Universal Binocular Mount. The UBM ships with two 5 lb counterweights sufficient for binoculars up to about 80100mm aperture. For heavier binoculars (100mm+), add one more. When you need one If your binoculars exceed 80100mm aperture or feel front heavy on the UBM, an additional 5 lb counterweight restores proper balance keeping the binocular "floating" effortlessly through