Antrader 16-Piece M6 x 16 Male Thread Knurled Thumb Screw Screw on Type Round Head Quick Removal Fastener Clamping Knobs: Amazon.com: Industrial & Scientific
MonsterBolts - M6 x 20mm 6 Lobe Pan Head, ISO 14583, Stainless Steel, 10 Pack: Amazon.com: Industrial & Scientific