"双帆集团旗下索尼克精密五金工业(昆山)有限公司:“北塔”钻尾自钻螺丝是中国第一家生产制造厂商，至今已有三十余年的生产历史。五金建筑类的钻尾自钻螺丝和抽芯拉钉规格齐全，通过美国AQSR质量管理体系ISO9001:2000认证。其技术力量雄厚，“好而不贵”是北塔紧固系列的标志，完善的售服务，及时的跟踪用户，深获国内外广大用户的支持和信赖。产品已达到国际先进水平，远销四十余个国家和地区。 "

"Shuangfan Group's SonecEnterprice(Kunshan)Co, Ltd ""Patta""is the first manufacturerin China for self-drilling screws. Wehave more than 30 years of production history.We provide complete specificationsof our hardware architecture seriesself-drilling screws and blind rivets.we meet all the requirements for theU.S. AQSR quality managementsystem IS09001: 2000 certificationTechnical prowess, ""good andinexpensive""are the motto of the“Pat” fastening series.Withperfect after-sales service, regularcheckup on costumers, has broughtsupport and trust of users home andabroad. Exceeding international standards, our products are sold tomore than 40 countries and regionsaround the world "