A Core deposit is a form of deposit you pay until returning your old part. If you don't have the core at the time of purchase, you must pay the core charge. That charge is refunded to you when you return the core.
3/8" x 2" x 4' Mild Steel Flat Stock. A36 mild carbon steel alloy. Common structural steel in U.S.A. Minimum yield of 36,000 PSI (250 MPa) and ultimate tensile strength of 58,000 to 80,000 PSI (400-550 MPa).