Stopblocks come in real handy when you want to cut several pieces to the same length. But you usually have to move the block to ensure that both ends are squared.
With the gate closed, position and clamp the block to the fence so that it's the exact finished length of the pieces away from the blade. Open the gate, position the workpiece, and cut. Then close the gate, flip the workpiece end for end, and make a final cut. The movable, hinged end gate of this stop block works on either side of a radial-arm or tablesaw blade.
—From the WOOD® magazine shop