This Prime-Line H 3787 Spiral Tilt Balance Tension Tool is used for winding spiral balances on spiral tilt window. The tilt balance tool features a mortise hook and slot design. The offset handle makes for easy turning. Wind clockwise to tighten. Constructed of chrome plated steel, this tilt window tension tool is strong, durable, and built to last. This tilt window spiral balance tool is 10 inches in length and features a single hook design. For further steel spiral tool dimensional information, please see the line drawing.