12mm-26mm钢构钻研磨,先端角160°-180°12mm-26mm麻花钻研磨,先端角90°-140°1.精准研磨在0.02mm以内2.操作简便,10秒钟便可研磨完一支钻头3.特殊设计合金钢筒夹4.精准研磨量0.2mm5.特殊构造直流电压马达6.品质稳定的GE钻石砂轮7.人性化设计,隐藏式筒夹盒8.携带式设计)