counter boring meaning in English

平底扩孔
钻柱坑
锪孔

The economic success of stim zet , a . s . is coined / shaped by products and service services such as materials , manufacture , cutting in addition to tools , counter bores and reamers . one can even receive offers on special , sale , tool holders and drills as well as on reamer with stim zet , a . s . in outstanding quality
是一家高别级的产品供应商，该企业使用多种工艺制造切断、削减,轮胎成型、服装批量生产,材料,卖、出售,锪钻、锪刀,专用润滑材料,刀具安装,钻床、打孔机、钻机。