【摘要】 根据国家历次对钎具质量抽查的结果，阐述了我国小钎头和中空六角形钎杆存在的质量问题，分析了出现问题的原因，并提出了改进建议。更多还原

【Abstract】 ccording to the random sampling examination of all previous times,conducted by China national departments concerned,the author discusses the problems on the quality of smallsize bits and hollow hexagonal drill steel,analyzes their causes and puts forward some recommendations of their improvement.更多还原