1、Excellent Aluminium Alloy: This woodworking drill guide is made of excellent industrial grade aluminium alloy, which is hard and durable, not easily worn and has a long service life. 2、CNC Anodised Surface: This woodworking drill guide has a CNC anodised surface, which is wear and erosion resistant and clearly graduated. 3、Drill Multiple Holes At Once: This woodworking hole drill guide has the ability to drill multiple holes at once and repeat the holes at a consistent angle without ruining the look or missing the angle, with steel sleeves sized to fit a variety of drill bits. 4、30° 45° And 90° Drill Angles: The fixed angle of this woodworking drill guide is deviation free and allows for quick drilling of 30°, 45° and 90° angle holes in posts and railings with impact drilling, saving time and effort and getting the job done quickly. 5、Multiple Hole Size: This woodworking hole drill guide is available in four hole drilling sizes to meet your different drilling needs.