The new Outbacker #79-16 layout square fills a niche in the pantheon of Chappell Squares that every builder or woodworker will appreciate. The Outbacker is perfectly balanced and fits as comfortably in your hand as in your back pocket. The most essential patented Chappell Universal Square tables are deeply etched into the 304 stainless steel square to include: • Hip & valley backing and bevel angles 1/12 to 30/12. • Fascia bevel and mitre angles for common roof pitches from 1/12 to 30/12. • Fascia bevel and mitre angles for hexagons and octagons. • Top cut common and hip/valley angles, • Common Pitch to Degree Table from 1/12 to 30/12. • Metric and Decimal/Fractional conversion table • Center & Zero Ruled scale in 16th's • Trigonometric Ratios Formula. The new Outbacker literally puts a wealth of knowledge right in the palm of your hand, and no batteries required.