This listing is for a set of 250 Hex Bolts with a Slotted Drive Style and a Hex Washer Head. The Screw Size is #1/4 and the Thread Size is #14. The Item Length is 3/4 inches and the Model is 1/4 -14 x 3/4. This set is perfect for use in various industries, such as Fasteners & Hardware, Business & Industrial, and Screws & Bolts. The System of Measurement is in inches.