[header] How to use a kreg jig [title] Measure the wood you're using. [step] Before you begin drilling, it's important to measure the width of the boards you'll be working with. The thickness is what you're looking to gauge here. 
Knowing the exact thickness of the board will enable you to drill the pocket holes at just the right angle. [substeps] Always measure your wood, regardless of the specifications given on the label.