Twin Pillow Block Linear Ball Bearing IPPW20G 1.25" Closed RST but the TWN blocks are

but the TWN blocks are double sized as if they were two SPBs fused together

2mm outer diameter from the Hevi-Rail linear guide system

you can order the matching 6mm wrench as part #6101227

Double the load capacity of a Single Roller Bearing (SPB) Pillow Block

It features a bonded Simplicity® self-lubricating FrelonGOLD® bore liner for maintenance-free linear

Twin Pillow Block Linear Ball Bearing IPPW20G 1.25" Closed RST but the TWN blocks areTwin Linear Ball Bearing Pillow Block, closed shell, with a 1. 25" ID (inner diameter) bearing inside a housing made of aluminum alloy. Features a low coefficient of friction for smooth operation, a heat treated alloy steel shell for durability, a resin retainer to reduce noise, and standard double seals at no extra cost. Twin Double size equal to two standard bearings mounted back to back Temperature Range: 4 +176F ( 20 +80C) Variant ID Sizes: