The 5-1/2 in. Galvanized Dock Cleat does have a rough texture due the the galvanized finish.
The hole opening is 3/4"
This dock cleat can support 360 MPA.
Depends on the cleat, some need hex bolts and some screw bolts or just screws
The hole distance from center to center is 31.7mm. The color of this Dock Cleat is Silver Grey.
The cleat would get mounted directly to the dock.