These custom silicon bronze slotted machine screws were manufactured domestically with a fillister head diameter of 0.5". 2,000 pieces in total were produced using C65500 half hard siliconze bronze material. Head height was set at .110 +/- .005" and the thread length underneath the head was set at .75 +/- .01". 1/4-20 thread was incorporated and the slot width was .055 +/- .01".