I have bought the 203260 and 203261. They seem to go down in size and weight as the numbers go up so the 203262 should be smaller, maybe 3.50mm. The 203260s are 3.95mm and the 203261s are 3.75mm in diameter. Three people have asked for dimensions on these and HK has not noticed. Since I have wasted my money here at HK on 2 sizes in order to find pipes that will fit my stock Align Gaui100/TREX250 landing skid mounts, I will not waste my money on more pipes. But I will recommend HK answer the questions on dimensions. And also recommend they make parts to fit the stock parts, not make up their own sizes. BTW, the DH 0116 steel pipes are the right size (3.50mm) for the stock Gaui100/TREX250 Landing skid mounts and I will be using those.