Worm gears come in a variety of sizes from power steering units to small DC motors and typically transmit higher torque ratios.Typical worm and wheel materials can vary from stainless steel, to nylon, to even some yellow metals (brass, bronze, etc). Not all greases formulated for worm gears are created equal. Selecting the right grease for your worm gear is almost as important as picking the gear materials – https://support.newgatesimms.com/choosing-a-worm-gear-grease