Amana tool 61340 Insert Carbide Adjustable Groove w/Scorer & Ring Nut 160mm D x 8.0 to 15.0mm CH x 1-1/4 Bore Shaper Cutter

Fully adjustable in 1/10mm (.004") increments from 8.0 to 15mm or 12.5 to 24mm. Sizes are changed by simply unlocking and turning the adjusting collar, and then 'dialing-in' the desired width on the easy-to-read scale. All eight knives have four cutting edges each for long tool life and economy.