drylin® R stainless steel shaft, EWMR, 1.4301 (304)
1045 Precision Shaft Steel Round Bar 1" Dia x 12"-Long T&G&P: Amazon.com: Industrial & Scientific
Silver Steel Bar Chrome Linear Guide Round Bar Linear Shaft 2-20mm 3mm 4mm 5mm 6mm 8mm 9mm 10mm 12mm 14mm 15mm 16mm 18mm 333 Mm - Tool Parts - AliExpress