The on-again, off-again U.S. tariffs targeting Chinese goods are officially on again.

The White House said on May 29 that the Trump administration would proceed with its proposal to impose 25% tariffs on $50 billion worth of goods from China. Meant to pressure China on trade issues, the 301 tariffs involve a range of products exported to the U.S., from flat screen TVs to medical devices.

Currently all nuts (HS code 73181600), including inch, metric, and locking nuts, are on the list of goods that will receive the 25% duty.

The final list of items will be announced on June 15, with tariffs imposed shortly thereafter.

“The move surprised many observers after the White House had for days trumpeted the outlines of a deal, in which any trade war with China would be put on hold while negotiators—led on the U.S. side by Treasury Secretary Steven Mnuchin —worked on a deal that would have China reduce its $375 billion annual trade advantage by buying more U.S. goods,” the Wall Street Journal reports.

The White House initially delayed enactment in early May after reaching some understanding to establish the framework of a future trade deal with China. However, media outlets noted that the understanding was “vaguely worded and lacked numerical commitments or any firm details.”

China has threatened to retaliate with its own tariffs on a range of U.S. exports.

The U.S. fastener industry is already grappling with uncertainties surrounding the 25% tariff on steel imports and 10% tariff on aluminum imports that Trump abruptly announced in March. The metals tariffs are often referred to as “232” tariffs because the applicable metals have been deemed to “threaten to impair the national security,” as defined by Section 232 of the Trade Expansion Act of 1962.

The White House has refused to issue blanket exemptions for such U.S. allies as Canada, Mexico, and European Union countries, preferring instead to provide 30-day reprieves while those countries attempt to negotiate long-term arrangements with the U.S.

The next deadline for the 232 tariffs is June 1.

In the U.S., more than 3,500 exclusion requests related to the 232 tariffs have been filed with the Commerce Department, according to Regulations.gov, though only about 550 have been made available for public comment.

Once public, domestic steel manufacturers have 30 days to file an objection.