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 #8-32 M4 Compatible External Thread Size 5/16 In.-18 Material Steel Overall Length 19/64 in Product Type Drive Tool Compatible with Grainger Part Number 4ZB94 Compatible with Manufacturer Model Number 329-008 Features Install Slotted Inserts without Engaging the Internal Thread Series E-Z LOK