Hirogeru‑kun is a compact and powerful tool for expanding pipes using a press machine.
Its main body is built from high-strength carbon steel and tool steel, treated with a salt bath nitriding process for superior surface hardness and corrosion resistance.
Each expander is crafted from hardened tool steel, delivering exceptional durability and performance even under heavy use.
With interchangeable expanders, Hirogeru‑kun can handle pipe inner diameters from approximately 31 mm (1.22 in) to 62.5 mm (2.46 in), making it a versatile solution for a wide range of applications.

To ensure safe and secure international delivery, Hirogeru-kun will be shipped in a durable, TRUNK CARGO-style storage container.

This case is commonly used for storing tools and outdoor gear, and is designed for both strength and convenience.
The available colors are green, gray, and black; however, please note that the color cannot be selected.

This is a dedicated expander designed for use with Hirogeru‑kun.
The listed price is for the expander only (main unit sold separately).

Made from tool steel and heat-treated through hardening and tempering, this expander offers excellent strength and durability.

When selecting an expander, please be sure to refer to the size chart in the product images.
Choose the appropriate model based on the outer diameter when closed and the maximum expanded diameter, according to the pipe you intend to process.

Please note:

To achieve the maximum expanded diameter, some adjustment work may be necessary.