Worm Gear Products Helical Worm Gear Speed Reducers Worm Gear Speed Reducers Worm Gear Sets Delroyd® Worm Gear, founded in 1923, designs and manufactures worm gear drives and engineered worm gear products. Installed ......Worm Gear Products Helical Worm Gear Speed Reducers Worm Gear Speed Reducers Worm Gear Sets Delroyd® Worm Gear, founded in 1923, designs and manufactures worm gear drives and engineered worm gear products. Installed in a wide variety of industrial applications around the world, the Delroyd® name has a reputation for high quality and long service life. Delroyd® offers a wide range of products including: Single, Double, Triple Worm and Helical Worm Reducers with ratios from 5:1 to 175,000:1 Custom engineered worm gear reducers Standard and special worm gear sets from 2" up to a 48" center distance Reverse engineering of gear sets and gearboxes Gearbox rebuilding services