Fixed Roller Bearing HVB-057 for Hevi-Rail Linear Guide Rail HVRI-08Fixed Heavy Duty Linear Roller Bearing with a 77. 7mm diameter, part of the Hevi Rail Linear Guide system, designed to handle substantial axial and radial loads. Compatible with the Hevi Rail Linear Rail HVRI 08 I Type (sold separately). The roller bearing is crafted from case hardened S450J2 MOD. carbon steel, offering durability, while easily interchangeable components help minimize downtime. Linear Roller Bearing Only Matches Hevi Rail Linear Rail