Review on Amana Tool Countersink Adjustable No Thrust Cutting Tools ~ Industrial Drill Bits by Eric Avina

The overall length of this tool is 4-3/8 inches. The measurement from the tip of the drill bit to the edge of the countersink is 1-7/8" with the drill bit depressed. As far into the body as possible. So if you're trying to tighten a screw less than 1-3/4". sink, this tool just isn't the right tool for the job. The Amana website states that #55154 is for use with #8 bolts. Most often I use #8, 3/4" to 1-1/2" long.