The ARP 621-1250 S/S Bolt Kit is a high-performance part made by ARP in the United States. This kit includes 6-point bolts with a 1/4-20 x 1.250 thread size, designed for engine and component applications. ARP is known for producing durable and reliable fasteners and stud kits, making this product a valuable choice for auto performance enthusiasts looking to upgrade their vehicles.