Features Suits perfectly for HAAS CAT 40 CNC tool, also suitable for most for Mazak CAT 40 but for VQC 20/40. Made of 40CR with high hardness and stable structure, not easy to break, and very durable for long use. Been through black oxidation treatment, which provides higher wear resistance and corrosion resistance. Each retention knob has undergone a separate magnetic particle test to ensure no cracks for safe work. There are 10pcs 45 degrees pull stud in the set, and the compact size with light weight simplifies the carrying. Specification: Item Type: Pull Stud Taper: CAT 40 Angle: 45° Knob: 0.589in Neck: 0.392in Orientation: 0.6360in L: 2.250in L1: 0.988in L2 Closing: 1.264in Knob Socket: RKW40 Material: 40CR Package List:10 x Pull Stud Package List 10 x Pull Stud