Include 10 pc impact ready 5/16" (7.94mm) nutsetter. Recessed Corners = drives on flats which minimzes shavings The bit has 1/4" (6.35mm) hex shank. Total 1.5" long. Industrial strength magnet maximizes fastener retention. Come with the storage box. | Forged with S2 steel for maximum durability. Product designed for use in Impact Drivers and Wrenches US-BASED CUSTOMER SERVICE: Available by chat, email, phone, or visit us at our customer service center in La Crosse, WI.