about this item

Clamping Range:1.5-13mm, Mount:1/2-20UNF

Classic keyed 3-jaw design securely holds a wide range of twist drills and step drill bits with 1/16-1/2 Inch shank

Socket Adapter: 1/2" Square Female, can easily transform power impact wrench to a drill

Constructed from premium chrome vanadium steel for durability and stands up to extensive daily use

Please Note: The chuck can NOT be used counterclockwise!