... will provide self-lubricating when using. The products are widely used in machinery industry, such as casting machine, mining machinery, ... result of friction between the bushings This products are widely used in car, machine , large machine tools and mould.4. ... (We Sell):All kinds of mould parts, self-lubricating pieces, oil-free parts, oilless guide bushings, oilless guide pins, Copper alloy, copper ...