Package includes: This socket set includes metric sizes - 1/4", 5/16" (8 mm), 3/8", 10 mm, 7/16" (11 mm), 12 mm, 1/2", 13 mm, 9/16" (14 mm), 5/8" (16 mm), 17 mm, 1 1/16", 3/4" (19 mm) Surface Paint Process: These broken bolt extractors have a black oxide surface that provides greater strength and durability and prevents corrosion. Easy to Use: 3/8-inch square drive. The extractor sets have hexagonal flats for use with an open-end wrench, pliers, adjustable wrench, sockets, or Vise-Grip locking pliers, and a 3/8-inch square drive for use with hand ratchets. Impact wrenches and pneumatic ratchets. Storage: Complete with a convenient case for easy transport and storage. Application: The twist socket set is used to remove rust and wear, to remove locking wheel nuts or damaged bolts, and to remove paint from nuts and bolts.