This is an optional Samix Enduro Brass Knuckle Bushing Set.
Features: Made of high quality CNC machined brass High quality 10.9 grade hardware with silver coating Direct fit original Enduro knuckles and C-hub Direct fit with SAMIX aluminum or brass knuckles and C-hub for Enduro
Includes: (4) Brass sleeves (4) M3x10mm round head screws