可换头式钻头  twist drills with exchangeable drill tips

差动式钻头  differential bit

滚动式钻头  roller bearing; bit rock

混合式钻头  hybrid bit

击入式钻头  drive bit

阶梯式钻头  step bit; crowned bit

可拆散式钻头  demountable bit

可拆式钻头  detachable bit

可卸式钻头  rip bit; bottoming bit

可折式钻头  jack bit

连续链式钻头  continuous chain bit

链式钻头  chain bit

喷射式钻头  Jet bit; jerk line; jet nozzled rock bit

潜铸式钻头  impregnated bit

三维式钻头  tricone bit

伸缩式钻头  collapsible bit; paddy bit; retractable bit; expansive bit

绳式顿钻钻头  cable bit

套筒式钻头导向工具  bit boss

替换式钻头  retorting amalgam