Power Driver Compatible Tool Type Drill Press Power Drill Compatible Insert Type Hex Drive Threaded Inserts Knife Threaded Inserts Solid Threaded Inserts Compatible Internal Thread Size #6-32 Compatible External Thread Size 1/4 In.-20 Material Steel Overall Length 9/32 in Product Type Drive Tool Compatible with Grainger Part Number 4ZB93 Compatible with Manufacturer Model Number 329-006 Features Install Slotted Inserts without Engaging the Internal Thread