1)With large ID and high flow; 2)Size distinguished by the needle-hub's color for the ... damage to the issue,less painful feeling to the patient;2)Semi-transparent needle-hub for the convenient observation of blood ... ",1/4",1/3",1/2",5/8",3/4",1",1.25",1.5",2". size diameter mm length and needle hub ... color OD(MM)GAUGECOLOR 0.25 31Gblue 0.30 ...