HSS Aircraft Extension Drill Bit Extra Long Bright 2Pcs 5/8 In. x 12 In.

ITEM DESCRIPTIONS: HSS Aircraft Extension Drill Bit Extra Long Drill Bit for Deep Hole Drilling MATERIAL: M2 High Speed Steel to ensure stable and long cutting life. SURFACE TREATMENT: Fully Polished bright to enhance surface strength. MANUFACTURING: Precision ground for flute and body shank and automatic drilling point tip grinded SHANK: General Purpose Round Straight Shank for most of tool holders, easy to chuck and unload. APPLICATION: Widely used in drilling deep holes in various of metal and steel processing works.