1.we are manufacturer 2.offer samples if you need usesremarks:used for I.V. catheters as an important adjunct, it provides pass and injection port infusion and transfusion.specification:7.6mm Diameter:4.19+0.02 Total height:7.75+0.1if you are interest in our products,pls. get in touch with me.i hope we can do business together,and look forward to hearing from you soon.