The balance clamp is U-shaped as a whole, with large and small openings, and single side with barbs, which can closely match with axial-flow blades of different thickness, easy to add and not easy to loosen. Weight range from 0.1g to 10g, made of 65 manganese elastic steel, blackened or galvanized or chrome plated, heat treated and tempered. Welcome to call for samples. If you don't have the right one, you can make it to order. (mainly used for dynamic balance correction of axial flow blades made of plastic or metal)