It is made of casting aluminium body, Sharp Alloy Steel Blade, to be used to cut  3-42mm diameter PE, PVC or other plastic pipe. Blade can be replaced.  Nice Blister Card Packing,

A pipecutter is a type of tool used by plumbers to cut pipe. Besides producing a clean cut, the tool is often a faster and more convenient way of cutting pipe than using a hacksaw, although this depends on the metal the pipe is made out of.
There are two types of pipe cutters. Plastic tubing cutters, which really look much like a pair of pruning shears, may be used for thinner pipes and tubes such as a sprinkler pipe. Then there is a pipecutter with a sharp wheel and adjustable jaw grips for use on thicker pipes. These are used by rotating it around the pipe and repeatedly tightening it until it cuts all of the way through.