4140 Ground Carbon Steel Sheet, 1/2″ (+/-.001″) x 12″ Wide x 36″ Length Thickness Tolerance: +/- .001″ Yield Strength: 93K PSI Rockwell Hardness: C30 Hardened ASTM A322 These sheets and bars are hardened for increased abrasion and impact resistance. Also known as chrome-moly steel. It resists fracturing from repeated stress. RETURN’S Where we are at fault. Item not as described, damaged or an obvious error on our part is guaranteed a full refund, inclusive of any & all shippingper our stated directions. RETURN DIRECTION’s; All returns MUST be in the original condition received. All returns MUST be shipped in the same manner as we shipped originally. ANY ADDITIONAL COST UP & BEYOND THE ORIGINAL COST, INCURRED IN RETURNING YOUR ITEM IS NOT REFUNDABLE. (if you choose to return an item at a higher rate than we originally shipped to you? This portion is NOT refundable) Refunds due because of a no error on our part are completed asan item refund only. Shipping is excluded. PLEASE feel free to contact us with any questions or concerns, as we strive for 100% satisfaction & happy customers. Items with a free shipping 20% restocking fee will apply.