The CTA 10-pc Bolt Extractor Set for Metric and SAE, No. 1232, has snowflake-shaped hex sockets designed for removing stuck or damaged bolts, nuts, and screws and is meant to be used with a 3/8” square drive ratchet. Each socket includes a knurled ring intended for extra grip. All sockets are constructed of SCM435 alloy steel. This set is not meant for use with air tools.