合金开孔器 不锈钢/铸铁/铝合金/非标金属 CAST IRON,STAINLESS STEEL,ALUMINUM ALLOY,ALL KINDS OF NON-STANDARD METALS ALUMINUM ALLOY,ALL KINDS OF NON-STCAST IRON,STAINLESS STEEL CAST IRON.STAINLESS STEEL 合金 锋利 刀刃 耐磨 开孔 排屑 迅速 顺畅