Techno Products Development Pvt. Ltd. Offers Shaft Mounted Worm Gear Boxes. Techno Products Development Pvt. Ltd. Is an ISO 9001:2000 certified company. The Shaft Mounted Worm Gear Boxes contains a hollow shaft of 14 to 45mm. The machine is mounted on a shaft for easy handling. It also has a ratio of 7/1 to 100/1.