Professional"s choice for precision assembly of 90-degree miter and butt joints * Die-cast aluminum frame with zinc-plated steel screws; counter-sunk holes for bench mounting * Each corner adjusts separately, allows clamping of different size/width work pieces * Maximum jaw capacity 3", jaw height 1/2", angle dimensions 3-1/4" x 3-1/4" * Great for picture frames, cabinet & furniture pieces, arts & crafts