The Thicknessing Tool is for trimming veneer strips (stringing) to precise thickness. The hole cut in the body provides a clamping surface. The tool should be either locked into a vise or clamped to a bench. Merely trying to hold it by hand will not work. Clamp the tool so that the cutters are positioned away from you.
Hard Maple body. Blades are made from Swedish Spring Steel. Other parts are Brass and Steel