HOLO-KROME socket head cap screws contribute in important ways in carrying out modern design techniques which call for smooth contours and surfaces, elimination of clumsy, bulky parts and use of lighter constructions as they apply to flanges, lugs, pockets, and cover plates. Because HOLO-KROME Screws are made of alloy steel and scientifically heat treated, they are stronger than conventional screws, size for size. Hence, fewer screws – or smaller screws – are required to fulfill a given holding assignment. As a general rule, a HOLO-KROME cap screw is comparable in strength to an ordinary screw of the next larger standard diameter. THE WORLD'S THIRD MOST EXPENSIVE FASTENER, Holo-Krome. The most expensive fastener anyone can buy is one that fails. The next most expensive fastener is one that saves a few pennies on price, then takes them all back by adding dollars to your installation costs. Next comes Holo-Krome precision fasteners, with greater endurance and fatigue life. Unlike fasteners of unknown origin, ours come with OVER 80 years of specialized engineering support – manufactured, tested and certified in our Wallingford, CT facility. HOLO-KROME is ISO 9001:2015 certified.