These heavy duty, professional grade rods are 915mm long and 19mm in diameter. The rods and the various end pieces just screw together (right handed, so be careful to turn the rods clockwise when using). The pack consists of 10 rods, a 100mm(4") plunger, a 100mm(4") drop scraper and a 50mm(2") double worm screw, complete with a carry bag to keep everything together when not in use. The Plunger is used to create a build up of pressure, which in turn forces the obstruction clear. The Drop Scraper moves over the obstruction, then drops into place allowing the material to be pulled back towards the operator. The Double Worm Screw is also used to retrieve an obstruction.