HIGH-QUALITY MATERIAL: The small square is made of high-quality industrial-grade aluminum alloy, which is hard and , easy to use and carry. Anodized orange surface, keep excellent finish, corrosion resistance and durability. This center marker woodworking set comes with four steel sleeves, so you ' have to worry about it being worn during drilling or drawing centerlines, causing the guide holes to become larger and lose accuracy. FOUR SIZES OF SLEEVE: Different from ordinary small square, this mini square can not only as a center scriber marking tool to draw the center line but also be used as a self centering dowel drill guide jig to drill the straight center hole. Four sleeves are included in the set, which are 1/4inch , 5/16inch , 3/8inch drill center hole drill sleeve and 2/5inch draw sleeve (allow larger pencils). WIDE APPLICATION: This board center finder tool kit contains two pins, which can quickly draw and drill center hole, easily check that chisel and planer edges are square, square your table and saw blade, measure workpiece height, draw vertical line, centering square is easy to use and can effectively save your working time, ' hesitate to own it immediately. Draw The small square can draw on boards 1.1inch to 2.8inch thick. Drill Center Hole The small squares can drill center hole in boards 1.1inch to 2.8inch thick. Measuring vertical Height The "inch" scale is marked on the side of the small square, which can be used to measure the vertical height of the workpiece. Draw Vertical Line The small square and the dowels can be used to quickly draw a straight line perpendicular to the bottom edge of the board. Measuring Right Angle The small square can measure whether the object angle is a right angle, accurate to 0.001inch. Colour:orange Material:aluminum Size:16.41 x 10.59 x 4.50 cm Package Contents: 1 x Small Square 2 x Pin 1 x 1/4inch Drill Sleeve 1 x 5/16inch Drill Sleeve 1 x 3/8inch Drill Sleeve 1 x 2/5inch Draw Sleeve 1 x Plastic Case Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.