Attach the cuff end with a hose clamp (not included), and screw mount the flange end. Also known as boots, these bellows are often used on CV joints. All are molded, which means they're airtight to keep contaminants out. Air venting may be necessary in fast-cycling applications. Slide these bellows over moving parts, such as rods and shafts.

0.04″-0.07″ thick bellows are more durable than 0.02″-0.04″ thick bellows, making them good for applications where parts are constantly moving.