Capacity, blade steel and whether the blade can be replaced are the three things that decide how long a plastic pipe cutter stays in service.
Domestic hot and cold pipework generally sits under 42mm, irrigation and PE mains work runs up to 63mm. The two-gear cutters cover 26/42mm and 42/63mm, and a single-size 32mm model covers the most common waste and conduit sizes. Stocking one capacity means half the installs need a second tool.
The 3pcs Pipe Cutters Set specifies 9CrSi blades at HRC 55-60. That hardness range is what keeps the edge through repeated cuts in PVC. A blade that is too soft rolls over and starts crushing the pipe instead of slicing it, and a crushed pipe end does not take a solvent joint cleanly.
An automatic withdrawal knife structure retracts the blade after each cut. The edge is then not sitting exposed in a tool bag against other steel, which is where most cutter blades are actually damaged.
A sealed cutter is scrapped when the edge dulls. The 32mm PVC cutter takes a replaceable blade, which suits an installer making the same cut hundreds of times.
Aluminium alloy and nylon bodies with a spray treated surface keep the weight down for overhead work and survive being dropped, which a cast body often does not.
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