Patent Screw of A-Stainless

Patent screw of A-Stainless. Come up with a new very low-torque wood screw meant for the fastest applications hard woods. This screw has successfully driven through two 3/4 inch thick Ipe and Bangkirai boards without twisting or breaking

http://www.taiwantrade.com.tw/EP/astainless/products-category-list/en_US/133160/PATENT_SCREWS/