The clamps are expensive,i bought two which was enough for a 20ft pole and the price was £71+vat,for this price it includes the glue and wipes etc,you have to cut part of the pole off to be able to put the clamps on,dont worry you will not lose any length,is it hard to do,dont know got my neighbour to do mine as i am rubbish at diy.are they worth the money i would say yes as it as made the job easier as it was a pain using the tool all the time.