REAMING DRILL BITS Product Overview Reaming Drill Bits from Brighttop Global Co., Ltd are engineered for enlarging existing drill holes in mining, tunneling, quarrying, and construction applications. Manufactured with high-quality alloy steel and tungsten carbide buttons, these reaming bits deliver stable drilling performance, excellent wear resistance, and reliable hole enlargement results across various rock formations. Product Specifications S/N Bit Dia. (mm) Thread Gauge