These bolt covers snap right on over the cylinder head bolts fitted on all 1984-1999 Evolution Big Twin, 1999-2017 Twin Cam and 1986 to present Evolution Sportster. Installation is as simple as tapping on to mount. Consequently there is no need for glue or silicone. Caps can be removed and reinstalled several times. Machined from brass and chrome plated by Midwest Acorn in the USA and sold in sets of 4.
