Chevy 350 4 Bolt Main Studs kit with 6 Point Hex nuts, suits 4-Bolt Mains chevy blocks, (Small Block Chevy 350, SBC)

ARP 134-5601 Main Stud Kits - Small Block Chevy - 4 Bolt Main 

ARP main stud kits help eliminate main cap walk/fretting and protect the threads in your engine block. They include studs made from 8740 chromoly steel and heat-treated in-house to 190,000 psi tensile-strength rating. 

Main Bolt Style:     4-bolt

Fastener Style:    Stud

Fastener Nut Style:    Standard hex

Works with Windage Tray:    No

Fastener Tensile Strength (psi):    190,000 psi

Nuts Included:     Yes

Washers Included:     Yes

Quantity:      Sold as a kit.

Notes:     Designed to fit large journal crankshafts.