Used To Re-Thread Damaged And/Or Jammed Threads. May Also Be Used To Thread Mild Steels. Hand Taps Come In Three Styles Taper, Plug Or Bottom.. Taper Style: Starts The Thread Square With The Workpiece. Plug Style: Generally Used In Thru Holes. Bottom Style: Generate The Thread To The Bottom Of The Hole. A Tap Set Contains 1 Taper, 1 Plug And 1 Bottoming Tap