Round Base Square Base Small Base Bell Mouth 01: Large base round needle, flared large base needle, support thicknessand length customized, the maximum thickness can be 10G. 02: Square base metal needle, this needle is a special needle, base interfaceis square, needle thickness and length support custom. 03: Small base flared needle, needle interface is copper nickel platedmaterial, needle tube part is stainless steel material, support customizedlength and other thickness. This needle can be used with specialhigh pressure valves.