Manufacturer of soil boring and diamond core drilling machines in Malaysia. Model D90R Boring Machine . SPECIFICATIONS . D45. D90R. CAPACITY: 50m (NW casing) 100m (NW casing) SPINDLE BORE: 47mm (AW rod) 92mm (NW casing) STROKE: 350mm. 500mm. SPEED: (reverse) 110/ 210/ 430rpm. 91/ 340/ 524/ (77)rpm.