Custom Stainless Steel Grooved Screws Knurled Head Thumb Screw. Extensive Material Options: Available in Stainless Steel, Brass, Bronze, Aluminum, Titanium, and various alloy steels. Customizable Surface Treatment: Offers plating, anodizing, polishing, and painting to meet specific requirements. Wide Size Range: Sizes available from M0.8 to M12, covering standard and custom dimensions. High Strength Grades: Grades ranging from 4.8 to 12.9 to suit diverse load and application needs. ISO and IATF Certification: Certified under ISO9001, ISO14001, and IATF16949 for quality assurance. Custom Head and Drive Types: Head type and drive type can be customized according to customer drawings. Fast Delivery for Stock Items: Delivery within 3-5 working days for goods available in stock. Experienced Manufacturer: Over 20 years of professional experience in fastener manufacturing.