Portable jig for creating pocket-hole joints The Kreg® Pocket-Hole Jig 310 makes it easier than ever to build DIY wood projects—whether you’re building your first DIY project, or you’ve been working with wood for years. The Pocket-Hole Jig works with mnaterials from 13mm to 38mm thick. The 310 features a hardened-steel drill guide and thickness stops for 13mm, 19mm, and 38mm material that give the versatility you need to build with boards and plywood found in home centers.