Intel said on Wednesday it would sell one-fifth of its stake in IMS Nanofabrication to private equity firm Bain Capital in a deal valuing the Austrian producer of chipmaking tools at about $4.3 billion.

Intel’s stake sale of 20% was valued at $860 million, according to Reuters calculations.

IMS, which was acquired by Intel in 2015, makes equipment that are critical for companies that make chips.

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It has delivered a significant return on investment to Intel while growing its workforce and production capacity by four times, Intel said.

Bain Capital’s investment in IMS will put it in a position to capture significant market share for its tools that are being widely adopted by chipmakers, Intel said.