A set of three (3) keys attached to a key ring. The longest key is marked "ZEISS" at the top, the shaft of the key has four keyed-ridges, which resemble the shape of a Philips screwdriver. The middle key is marked "ASTRA" at the top, the shaft is a hollow cylinder with a narrow, vertical, parallel cut up each side of the cylinder. The smallest key is unmarked, the shaft is a small, hallow cylinder with a keyed-nub at the end. The key ring is made from a thick-gauged, half-round wire.