Hook clamps are designed to manually swing into clamping position, then clamp straight down by screw action. These clamps allow clear loading while swung away in unclamped position. Ideal in tight spaces where high clamping force is required. Long-arm Hook Clamps are available with either a plain arm (shown here) or a tapped arm. Available in three sizes, with 5/16-18, 1/2-13, and 5/8-11 mounting screws (M8, M12, and M16 in metric). Made in USA.