ITEM NAME:300mm(12'')Adjustable Engineer Combination Try Square Set Right Angle Ruler A#S Product Description Description: Specifications: Material: steel Product size: 30 x 11 x 1.5cm/11.81 x 43.7 x 0.59'' Product weight: 143g Purpose: horizontal ruler, wood working accessories Instructions: For a 90 degree Angle between the ruler and the handle, after the upper plane of handle and the ruler are parallel, then tighten the nut. When you want to move your handle, firstly loosen the nut and pull it down, let the handle loosen with the ruler, and then you can succeed Included: 1 x Ruler.When you want to move your handle, firstly loosen the nut and pull it down, let the handle loosen with the ruler, and then you can succeed. For a 90 degree Angle between the ruler and the handle, after the upper plane of handle and the ruler are parallel, then tighten the nut.