166403 VC.692/40-SST-p-M8x30-PO Elesa Stainless Steel Lobe Knobs with Resin Tip M8 X 30 — Steel City Supply
Amazon.com: LifCratms M8 x 40mm Thread Star Knob 2Pcs, Plastic Star Shaped Clamping Knob Handle Hand Tightening Screw for Umbrella Base Replacement : Industrial & Scientific
RS PRO | RS PRO Black Multiple Lobes Clamping Knob, M8, Threaded Stud | 188-3456 | RS Components
Metric Clamping Knobs M4 M5 M6 M8 by Nils Kal | Download free STL model | Printables.com
2 Set M8 Knob Nut T Screw T Track Clamp Accessories Bolts Knobs T Slot Bolts And Knobs Clamps For Woodworking Hand Tools Jigs - AliExpress