Outer Diameter:1/4" (6.5mm),Inner Diameter:1/6" (4.4mm) Lead-free,11 different sizes replacement tips for soldering the different components of PCBs Fits Hakko, Radio Shack 64-053, Atten, Quick, Aoyue, Yihua, X-Tronic,Vastar,Sywon,Tabiger,SOAIY and other brand iron station Such as:900M, 933, 936, 937, 376, 907, 913, 951, 898D, 852D+, 878AD Fits ALL of X-Tronic Models, Except for 3010-XTS
