M3 M4 M5 M6 Brass Knurled Thumb Screws Flat Head Hand Tighten Thumb Screws. Customized Thread Length: Thread length can be customized according to specific requirements. Customized Color Options: Available in customized colors to match specific needs. Wide Material Selection: Available in Brass, Stainless Steel, Steel, Bronze, Iron, Aluminum, and Titanium alloys. Multiple Standard Compliance: Meets ISO, JIS, GB, ANSI, BSW, DIN standards or non-standard custom specifications. Diverse Surface Finishes: Options include Plain, Zinc Plated, Black Oxide, H.D.G, and DAC. OEM & ODM Services: Full customization available from samples, designs, or minor modifications. ISO9001 Certification: Certified under ISO9001:2008 and ISO9001:2015 quality management systems. Free Sample Availability: Free samples provided if stock is available; otherwise discussed with customer.