The Veritas saw depth stop is an effective and simple way to control the depth of cut when using a tenon saw. It consists of a 230mm (9") long aluminium rail, which has a high friction magnetic strip. This holds the strip onto the saw blade. Attached to the strip are two stainless steel rods that give the rail a 60mm (2-3/8") range of adjustment. The two clamp knobs, with rare-earth magnet bases, register against the spine of the saw. All you need do is simply tighten the brass knobs to lock the rail at the desired cut depth, foolproof.