HSS Straight Groove Step Cone Drill Countersink Bit Set Wood Metal Hole Cutter Drilling Woodworking Tools

The step structure, a variety of standard size drill carve aperture, a box arrived a ladder drill bit.Without the use of center punch, easy to break, a step drill specifications apply.Deburring, chamfering, expanding the oval hole.Small sway, without leading to use a center punch can carve out a nice aperture.Surface treatment: .Products for automotive processing, aerospace, sheet metal processing,Installation and maintenance of electrical and other industries.High-altitude operations with hand drills and other tools.Package Included:4pcs Sizes:5 step drill bit: 4-12mm (4mm, 6mm, 8mm, 10mm, 12mm) 9 step drill bit: 4-20mm (4mm, 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm) 10 step drill bit: 3-12mm (3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm)No need for shaking or reducing friction, capable of withstanding heavy-load operations, making the cutting process smoother

• The step structure, a variety of standard size drill carve aperture, a box arrived a ladder drill bit.
• Without the use of center punch, easy to break, a step drill specifications apply.
• Deburring, chamfering, expanding the oval hole.
• Small sway, without leading to use a center punch can carve out a nice aperture.
• Surface treatment: .
• It is convenient to carry. The drill bit is placed in a plastic box, which makes it easy to store and carry .