Multiple Size Tap Set High Speed Steel Number of Pieces 10 Thread Sizes Included 1/2 In.-13 1/2 In.-20 1/4 In.-20 1/4 In.-28 3/8 In.-16 3/8 In.-24 5/16 In.-18 5/16 In.-24 7/16 In.-14 7/16 In.-20 Thread Standard UNC Thread Direction Right Hand Tap Finish Bright (Uncoated) Thread Limit H1 H2 H3