1-1/8" Stainless Steel Hex Bolts Have a Hexagonal Head Used With a Wrench or a Socket.
1-11/16" Flats-Wrench Size, 31/32" Thickness.
1-1/8" Standard Commercial Pattern Round Flat Washers.
ID 1.187" OD 2-1/2" Thickness 0.125"
ID 1.129" OD 1.838" Thickness 0.281"