Cementex IS38-23ML 12PT WO3/8 in. x 23mm Insulated Metric Square Drive 12-Point Deep Wall Socket, Flush Connect1,000 Volt Rated insulated square drive sockets for use with insulated tools including ratchets, torque wrenches, extensions bars, T-handled square drives, breaker bars, etc. Unique coating technique allows socket to be shaped to allow maximum access to tightest of places while providing highest level of protection Flush connect sockets designed for use with Non-"X-Drive" and "X-Drive" Ratchets Should be used with flared extension bars Tool complies with ASTM F1505 and IEC 60900 standards and helps meet requirements of OSHA 1910.331-335, NFPA 70E, and CSA-Z462 Tested to 10,000 VAC and Rated for 1,000 VAC when working on or around live parts Dimensions: 3/8 in. x 23mm 12-Point deep wall, flush connect