Product Details1.Rotational Template Heads - 360 degree rotational tread templates can be adjusted the angle by the screw nuts to fit and measure the regular or irregular shapes of stairs treads.2.Adjustable Length - The connecting rods can be used separately or combined in different combinations to adjust the length or height from 9" - 54" to meet more needs in your projects.3.Stair Tread Template Tool - Contains 2pcs 8" connecting rods, 2pcs 12" connecting rods, 2pcs 16" connecting rods, 2pcs 8" template head, 10pcs screws, 10pcs knobs.4.Accurate Measurement - Made of durable and strong stainless steel which is resistant to wear and tear, with clear laser scales on the surface, reducing the risk of error measurements in your projects.5.