1)these tools are for plastic plate or pipe  welding using, for house flooring making use.including plastic pipe reamer, plastic plate cutter, welding line pressor etc. 

2) knife is for cutting plastic,

3)wheeler is for smoothing the joint after welding,

4)reamer is for deburing the tubes after cutting,

5)steel plate is for deburing the plate of PVC.

knife, wheeler tool set for plastic welding