They are recommended for use in through or blind holes which allow for chip accumulation in the bottom of the hole.
Ideal for threading a wide variety of ductile materials, copper and copper alloys, brass and non-metallics.. 3/8"-24 HSS Tin Coated 4 Flute Plug Tap Spiral-Pointed taps, or Machine Taps, were originated to solve the problem of tap breakage in through hole tapping.HSS, Spiral Pointed, Tin-Coated, Size: 3/8-24, Limit H3, Number of Flutes 3 The Machine Tap shoots chips ahead of the cutting action, thus reducing loading and clogging in the flutes.