This listing is for one set of ARP Stainless Steel Exhaust Manifold Studs Washers & Copper Nuts for the Nissan RB26DETT engines found in the R32, R33, R34 Skylines & WC34 Stagea 

These studs have a hex key slot to assist in assembly 

Included = 12x Studs (SS) + 12x Washers (SS) + 12x Copper Nuts 

Part Number = ARP-IESK-005 (IESK-M8C-2_EXH)