Drill Bit Diam: 1-9/64". Pipe Size: 1". Threads Per Inch: 11-1/2. Thread Standard: NPT. Cutting Direction: Right. Style: Taper. Material: High Carbon Steel. Type: Pipe Tap. Made from carbon steel in right hand configuration only. These taps are especially suited for restricted area work. All taps have taper of 3/4" per foot. Hand use only. Marked with drill size for pilot hole.