Specifications: Product Name: Spiral grooving center drill bit; Material: High speed steel; Color: Black; Type: A:1mm; B: 1.5mm; C: 2mm; D: 2.5mm; E:3mm; F: 3.5mm; G: 4mm; H: 5mm; I: 6mm; J: 8mm; Purpose: It can be used for drilling die steel, stainless steel and other metals; Quantity: 1 Pc × Center Drill Bit. Features: - Fully ground type A center drill. - High-speed steel material is sharp and durable. - Precision manufacturing, quality assurance. - A reasonable cutting method will make you do more with less. - The drill bit is fully ground, overall heat treatment, sharp edge, high-speed steel forging, high heat resistance and durability. Package Included:(optional) A 1 Pc × 1mm Center Drill Bit; B 1 Pc × 1.5mm Center Drill Bit; C 1 Pc × 2mm Center Drill Bit; D 1 Pc × 2.5mm Center Drill Bit; E 1 Pc × 3mm Center Drill Bit; F 1 Pc × 3.5mm Center Drill Bit; G 1 Pc × 4mm Center Drill Bit; H 1 Pc × 5mm Center Drill Bit; I 1 Pc × 6mm Center Drill Bit; J 1 Pc × 8mm Center Drill Bit