Works on wide mouth .The Vintage Yo-Ho Jar Opener is a unique and charming antique tool that is sure to add character to any kitchen or collection. Made in the United States, this vintage wrench lid tool from Monticello, Iowa is a rare find for collectors and those with a love for retro and mid-century items. Its classic design and craftsmanship make it a functional and decorative piece that is both practical and nostalgic.