Cuts tubing from 3/16" to 7/8" Spring tension keeps tubing pressed agains blade Tighten tool 1 time no need to retighten as you cut No slip handle Replaceable blade This tube cutter features a spring loaded tensioner to allow the cutter to cut through tubing without adjusting the tightening wheel. Other testers function on the turn-tighten-turn method to cut tubing. This version simply attach to the tubing, tighten knob to proper setting: turn the tool to cut the tubing.