This is a custom Mercury V6 powerhead stud kit for a later-style studs-down Mercury Racing 12" mid-section. Made with high-quality 190,000 psi tensile strength chromoly with a durable black oxide finish that should be lightly coated with grease when dropping on your powerhead. 
 
These powerhead studs have a super convenient broached Allen Head end for easier installation and removal from the block.
 
Includes eight (8) Mercury Powerhead Studs sized for the 12" studs-down Mid Section, eight (8) case-hardened thick-washers to fit the nut seats cast in the mid, and eight (8) stainless steel nylock nuts.
Contact Mike Hill at STVracer@yahoo.com