This is a set of ten (10) 3/8" stainless steel case-hardened thick-washers and ten (10) stainless nuts, two (2) jam nuts for the front two powerhead studs, and eight (8) full size found on Mercury Racing 225, 245, 260 HP, 280 ROS, and 300 Drag powerheads.
 
These washers are chamfered (beveled round) on one side for easier installation and removal. The kit is enough for each of the ten 3/8-inch studs.
 
These washers fit 1976 to 2005 Mercury V6 powerhead studs found on 135, 150, 175, and 200 HP outboards with 12" racing, 15" ROS, 20 Fishing / Bass, and 25" XL midsections.
 
Part Numbers Mercury Washer:
12-70833, 12-45175, 12-F1778, 2550W23059, F1778, 45175, 70833, 856774, 12-856774, 8M0214963
 
This kit includes ten (10) 3/8" stainless steel case-thick washers. 3/8"x ID x 3/4" OD (.406" x .750" x .105") and ten (10) stainless nuts, two (2) jam nuts for the front two powerhead studs, and eight (8) full size.
 
Contact Mike Hill at STVracer@yahoo.com