Specification:Drill Diameter/Overall Length/Flute Length:1mm/32.5mm/13mm2mm/49mm/25mm3mm/61mm/33mm4mm/73.5mm/41mm5mm/85.5mm/52mm6mm/91mm/56mm7mm/108mm/72mm8mm/116mm/76mm9mm/123mm/80mm10mm/131mm/85.5mmMaterial: High Speed Steel 6542, CobaltShank Type: Round Straight ShankTool Flute Type: SpiralPackage Content: 10 Pcs x Twist Drill BitsDescription:1. High-speed steel straight shank drill bits are good for most general purpose applications, offering a combination of hardness and toughness for wear resistance.2. Can be used with machining equipment, hand drill, and rechargeable drill. The material with high hardness needs to be added with water while drilling. The effect of adding water is better and the service life can be extended.3. For use in a wide range of metal and non-metal materials such as stainless steel, aluminum alloy, iron, copper, and brass.