Well made exhaust silencers with internal baffles and gloss black powder coat finish.
These silencers have an 1, 1/4" BSP male threaded pipe of approximatly 1, 1/2" long and the silencer body measures 4, 1/2" diameter by 3, 3/4" long.
Can be used on Lister A, F, ST, SR, LD2 and Petter PH twin cylinder engines to name a few, also suitable for many other engines using this pipe thread size.