Support Rail for 2" Linear Shafts - Aluminum SR32PD-016.000-SL Pre-Drilled Length: 16" Simplicity Linear Plain Bearing but the TWN blocks are

but the TWN blocks are larger

incorporating a heat-treated alloy steel shell for enhanced durability

Double Plain Linear Bearing of 13mm JIS Metric ID with a Square Flange (end-mounted) and a precision running clearance of 0

as if two Single Roller Pillow Blocks (SPB) were fused together to create a bigger bearing

square flanged end-mount housing

Support Rail for 2" Linear Shafts - Aluminum SR32PD-016.000-SL Pre-Drilled Length: 16" Simplicity Linear Plain Bearing but the TWN blocks arePre Drilled Linear Support Rail of 16" length, made for a 2" diameter linear shaft, sold separately. Cold Stamp manufactured from aluminum in the PBC Linear factory in Roscoe, IL USA. Use open shell linear bearings on shafts fused with these support rails. Linear Support Rail only Shafts sold separately Pre Drilled according to industry standards (hence the PD part number)