This is essentially a low-profile bench dog with a quick-release sliding jaw for holding work. Its 1/4-20 T-bolt can be secured at any point on a T-slot track using a hex key, which also locks the orientation of the jaw.
Dubbed a "blade" due to its flat design, it projects just 1/4" above a work surface to permit maximum access to a workpiece. Used much like a toggle clamp, it has a thumb-operated eccentric cam lever to control the sliding jaw, so you can quickly secure or release work.
With 1/4" range of travel, the jaw has limited throw, but applies up to 300 lb of clamping force. Flats on the cam provide secure stops at 1/8" and 1/4" of travel. The 1 1/2" × 1/4" jaw face has a 5° inward cant to help hold wood securely. The cam and jaw are cast steel, heat-treated for surface hardness.
Made in Canada. Patented.