Size:20 lb. River anchors are intended for use in lakes and rivers with strong currents or drifts. The design uses a combination of weight and flukes for a firm hold, even in windy conditions. The large flukes hold well in hard, muddy, rocky, weedy or grassy bottoms. Vinyl coating on anchor body and flukes protects boat surfaces. For best hold, lower anchor slowly to allow flukes to penetrate. Please note that this anchor design is intended for current or high drift environments only.