The new TxDOT standard specifications feature heavy-duty, security-bolted castings engineered for durability and compliance. The 19″ model includes a single-bolt cast iron ring and cover, while the 24″ and 32″ models are equipped with four-bolt ductile iron covers and cast iron rings, all featuring the TxDOT logo and lettering. The uncoated cast gray iron components meet or exceed ASTM A48 CL35B and AASHTO M306-10 (M105) standards, while the uncoated ductile iron covers adhere to ASTM A536, grade 80-55-06 specifications. Each set comes with stainless steel 1/2″ x 13 security pentahead bolts and washers. Proudly American-made, these products are in stock and offer custom lettering options for special orders, delivering exceptional durability, security, and full compliance with TxDOT and industry standards.