For those who are redlighting by a few hundredths of a second, an Oversized Harrington Switch is exactly what you need. This high amperage, extra long travel microswitch, delays your reaction time up to .03 (three hundredths) seconds. It is very useful in classes that do not allow delay boxes. The oversized mushroom cap provides comfortable and confident releases with a diameter just over 1 inch. The screw on/off collar allows you to increase or decrease the amount of throw for different situations.
Note: This button IS legal for use in NHRA Racing.