Pre tinned soldering tips with 38mm external diameter 196507 is compatible with silverline 15w soldering irons 264572 and 476348 and 25w soldering irons 643115 and 629057 675071 is compatible with silverline 40w soldering irons 263572 and 917270 includes 3 x point 3 x chisel 2 x bent and 2 x cut off tips