The Milescraft 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 metal guide is held at a tight tolerance and allows you to drill a hole 90° 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 design of DrillBlock fits into the hands with ease and alleviates awkwardness.