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 5/16 In.-18 M8 Compatible External Thread Size Not Applicable Material Steel Overall Length 33/64 in Product Type Drive Tool Compatible with Manufacturer Model Number 851618-20 851618-25 951618-13 951618-25 Features Install Slotted Inserts without Engaging the Internal Thread Series E-Z Hex