Union Butterfield 3306E(UNC) High-Speed Steel Thread Forming Tap, Extra-Long, Uncoated (Bright) Finish, Round Shank With Square End, Bottoming Chamfer, H5 Tolerance, 6 O'all Length, #6-32 Thread Size Size: #6-32, Model: 1321012 Cold-forms threads in through holes and blind holes without producing chips Extension Rol-Form tap is extra-long for extended reach, with lubricant grooves to improve coolant Bottoming chamfer for threading the bottoms of blind holes Available in UNC (Unified Coarse) or UNF (Unified Fine) right-hand thread options for different High-speed steel for compatibility with a variety of materials