... V point boring wood drill bits 1: 70mm long, 10mm *20mm shank 2: tungsten carbide ... materials. Product description: Product name: 70mm long through hole V point boring wood drill bits ... Maximum drilling depth: length 57.5mm,20mm; length 70mm,33mm. Main Advantages :1. Better for machine tools ... special requirements are still welcome here. 70mm long through hole V point boring wood drill ...