With this barrel combo screw, all components are matched. Heads on both male and female parts are identical. Shoulder screws and female barrels allow different grip lengths to be achieved. Machine screws present a finished set appearance. This screw has an 8 to 32" thread with a 3/8-inch depth and is made of steel with a zinc-plated finish. It measures 3/8 inches long with a barrel diameter of 13/64 inches and a barrel head diameter of 13/32 inches. There are 50 screws per package.