The Roller Bearing 'V' Blocks are accurately assemble and precision ground on the bottom taces. Four high precision ball bearing on the top. Thus, providing self aligning wearing hard accurate supports which will not damage even the most delicate work piece. "Crystal" Roller Bearing 'V' Blocks are very useful in tool room, machine shop, assembly, inspeciton, for checking and marking odd shapes jobs, crank-shafts etc. Due to the Roller Bearing the work pieces are not damaged. It has equal bearing properties. Bearing become excessively without causing inaccuracy can be replaced easily. Due to its design feature, the Roller bearing ' V ' Blocks are supplied in matched pairs. Features: The Roller Bearing V Blocks are accurately assembled and are precision ground in matched pairs. Four high precision double Z bearings are provided on the top . This facilitates in the inspection of heavy round components. Work pieces don't get damaged due to bearings. The base plate of roller bearing V block is hardened to 55 HRC ± 2 HRC.