Rust-proof treatment (RPT) is available for Nikken standard products.
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The RPT tool has been provided with excellent protection treatment against rust and corrosion.
A rust-proof and corrosion-proof coating film made of tri-iron tetroxide (Fe3O4) and ferric oxide (Fe2O3) is used to cover the tool surfaces. This coating penetrates the inside base material of the tool from its steel surface so that it can provide a resilient rust-proof and corrosion-proof effect. This rust-proof treatment is prescribed by the U.S. MIL standards (MIC-C-13924).