DrillBlock™ allows you to drill straight holes every time. The two product v-grooves allow for usage on corners and even cylindrical surfaces too. The inserted solid metal guide offers the six common drill diameters: 1/8", 3/16", 1/4", 5/16", 3/8", and 1/2". The metal guide is held at a tight tolerance and allows you to drill a hole 90 degrees to any surface, centered on a round item or even directly into the corner of your project. Centerlines ensure accurate alignment when drilling into various surfaces. The non-slip padding holds the DrillBlock™ in place while preventing both slipping and marring on wooden work pieces. The ergonomic handy design of DrillBlock™ fits into the hands with ease and alleviates awkwardness.