uxcell 12mm x 331mm Hardened Rod Chrome Plated Linear Motion Shaft/Guide

Magic&shell 2-Pack 12mm Flange Shaft Coupling High Hardness Metal Axis Bearing Fittings DIY Model Accessory Rigid Flange Guide Shaft Coupler Motor Connector

Sydien 12mm/0.47" Diameter Ball Mounted Pillow Block Insert Bearing 4 Pcs (12mm)

ReliaBot 12mm x 400mm (.472 x 15.75 inches) Case Hardened Chrome Plated Linear Motion Rod Shaft Guide - Metric h8 Tolerance

uxcell 12mm Inner Dia H13D18 Rigid Flange Coupling Motor Guide Shaft Coupler Motor Connector 2PCS for DIY Parts

uxcell 12mm Linear Ball Bearings LMK12UU Extra Long Square Flange, 12mm Bore, 21mm OD, 57mm Length 2pcs

10pcs LM12UU 12mm Linear Motion Ball Bearing Bushing for 12mm Rod 3D Printer CNC Parts

Eowpower 2Pcs 12mm Bore Diameter Ball Mounted Pillow Block Insert Bearing

Two (2) 8mm x 406mm (.315" x 16") Case Hardened Chrome Linear Motion Rods/Shafts/Guides - Metric G6 Tolerance