Revolutionary lightweight design, perfectly balanced saw frames. Ergonomic handles reduce fatigue and provide greater dexterity. Patented blade-lock design eases blade insertion, maintains perfect alignment and eliminates wobble which reduces blade loss during use. Precision-made at our Swiss factory of the highest quality spring steel with non-glare finish. Set screws can be used on either the left or right side of the frame according to your preference. Blade tightening screw must be opened wide enough to allow saw blades to be inserted all the way. 4" depth.