The Lock Rod Drain Rod System features robust, durable, and flexible polypropylene rods with superior interlocking fittings. The double worm screw breaks up obstructions and the plunger creates pressure build-up, forcing obstructions clear. The rods can be rotated in either direction and will remain securely attached. Knurled screw connectors provide an enhanced grip and tool-free connection. This set includes 10 x 920mm interlocking rods, 1 x 100mm rubber plunger, and 1 x 50mm double worm screw.