With the help of diligent and adept professionals, our organization is prominent Manufacturer, Exporter and Supplier of SFX Brand10 Pcs BT40 45 Degree Solid Retention knob Pull Studs in Luoyang, Henan, China. Product Features 1. Each pull stud is tested thoroughly which ensures the quality of the pull stud 2. Made from fine alloy steel 20CrMnTi with treatment to HRC 53-57 3. Hard outside and soft inside, with higher wear resistance and better toughness 4. High quality black oxide ensures long pull stud life and a non-rusting surface 5. Precision turning on all critical surface 6. Large selection for specific machine models, custom design accepted BrandSFX/OEM StandardMAS 403-1975 The Article No.Please contact us for detail. Material20 CrMnTi HardnessHardness of Head 53-57