Support Rail for 20mm Linear Shafts - Aluminum SRM20PD-0900-SL Pre-Drilled - Length: 900mm Simplicity Linear Plain Bearing but the TWN blocks are

but the TWN blocks are larger

Twin/Double size equal to two standard pillow blocks mounted back-to-back

Linear Shaft made of 440 Stainless steel with a 5/8" diameter and 12" length

with a 60mm compensated ID that provides a 0

Support Rail for 20mm Linear Shafts - Aluminum SRM20PD-0900-SL Pre-Drilled - Length: 900mm Simplicity Linear Plain Bearing but the TWN blocks arePre Drilled Linear Support Rail of 900mm length, made for a 20mm diameter linear shaft, sold separately. Cold Stamp manufactured from aluminum in the PBC Linear factory in Roscoe, IL USA. Use Open 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)