The D-splicer is available as a single needle with a fixed handle and comes in 4 sizes. The needles can not be replaced. The F10 needle is to be used on rope Ø upto 2mm The F15 needle is to be used on rope Ø from 2 to 4mm The F20 needle is to be used on rope Ø from 4 to 6mm The F25 needle is to be used on rope Ø from 6 to 8mm Rope sizes are approximate as the needles work in many other situations. For example use it to pull the cover of a 14 mm rope back in itself.