This is an undercutter/underbucker I manufacture in my shop. This tool is made with a solid brass body and wheel. The body slides and clamps onto a stainless steel round rod. The round rod allows you to set the wheel in just about any position. You drive the rod into the log and adjust the wheel up and down to a desired location. You rest the saw in one of the wheel slots and apply down pressure on the wheel which moves the saw upward into the log. Contact me for current price and availability.