Description: Hinge Hole Set: Includes 5 pieces shank, 5 different boring diamters:15, 20, 25, 30, 35mm. Removeable depth adjust the drilling depth, Adjustable effective depth: 10mm~40mm, perfect for drilling clean, flat and smooth bottom holes with no chipping, to existing holes and bore any arc . Hardened Carbide Steel: of carbide steel provides maximum strength for durability and , , high hardness, smooth cutting. Efficient for Boring Hole: The middle spur helps center the bit, while the helps maintain the position when drilling angled or overlapping holes. Arc curve beneficial to chip removal, perforation efficient. Used for Drill Machine: With round shank, for installation on drill press, hand drill, bench drill or other vertical drilling machine, all of soft wood, plastic, plywood and other low hardness materials. (Avoid cutting ferrous non wood materials, such as steel, iron, sand, etc) Boring Conceded Hinges & Locks: Typically used for boring concealed hinges and door locks. Perfect products perforation, wood processing and maintenance, model production, installation of spherical door, drawers and other occasions. with a hinge hole template, can cabinet hinge mounting of 35mm or 40mm diameter. Size Chart: Total Length: 80mm/3.15inch Package Includes: 5 Pieces 15/20/25/30/35mm Note: 1. Please slightly error due to manual measurement. 2. Due to between different monitors, the picture may not reflect the actual the . 3 shopping!