MultiTAP - Roll Form MultiTAP™ Roll Forming Tap, Measurement System: Imperial, 5/16-18, UNC, Bottoming Chamfer, 0.787 in Thread Length, 3.543 in Overall Length, Right Hand Cutting, Class of Fit: 2B/3B, 0.318 in Shank Dia, 2.17 in Shank Length, HSS-E, TiN Coated