The Genius Tools 18-pc 3/4" and 1" Drive SAE Hex Bit Socket Set, No. BS-6818H, has a range of 9/16” to 1-3/8” and includes both 3/4” and 1” drive bit holders. These bits are designed for use with both pneumatic and electric impact wrenches and are packaged in a durable locking blow-molded case. The chambered ends allow for easy engagement of the drive tool fastener and the drive end is designed with a pin-retention hold and groove. The bits are made of specially heat-treated Chrome Moly Steel to help ensure long life, durability and safety, according to the company.