You will receive a bag of about 100-150 optical screws/hardware/pins/springs. These were used on old Wollensak, B&L & other binoculars, lens assemblies, and other small optical items. They range in size from 0.5mm to 3mm diameter. Also included are a few nuts, and a couple pins. You will receive 5 of each style. Very hard to find! Buy 5 bags and save $25. Like getting one free.