Description:1. [Quickly Find the Center]: use the standard set of self-centering guide center drill bit to accurately locate drilling centers on flat, round, edge, and spherical machine tools; Drill perfectly straight holes no matter the shape of the board.2. [For each shaped design]: the plastic guide drill provides perfectly perpendicular holes; Angle drill guide drill with V-grooved and countersunk disc shape to be aligned with any edge of the plate, flat or rounded side or wooden wheel for optimal control and precision.3. [Easy to Use]: drop the center punch pin inside the 6mm sleeve to find the exact center; Switch the sleeve to match the size of the drill bit and the drill bit; to find the centerline on the edge, Place 2 small nails in the hole for the guide drill and rotate the guide drill so that each nail touches the opposite side of the wood. Specifications:100% brand new and high qualityMaterial: Plastic, MetalColor: As the picturePackage included:1 set * punch locatorNote:1. Please allow 1-3cm differs due to manual measurement.2. Due to the different display and different light, the picture may not show the actual color of the item. Thank you for your understanding.