The three 3366 Heavy Duty Feet for Heavy Duty Tripod from Miller are made of molded plastic with a rubber pad and attach via a stud that has both 1/4"-20 and 3/8"-16 threads..

• Replacement Feet for 3350 HD Tripod
• Molded Plastic Foot with Rubber Pad
• 1/4"-20 and 3/8"-16 Threaded Stud