High Quality Material: The Star Shaped Handles Are Made Of High Quality Bakelite And Copper Female Thread, Which Has Smooth And Wear-Resistant Surface, Clean And Precise Thread, Durability And Long Service Life Life. Star Grips Are Ideal For Manual Adjustments In Mechanical Engineering.Ergonomic Design: Polished Surface And Star-Shaped Design Of The Female Thread Grip Provides A Comfortable Grip, Easy To Screw In And Prevents Slipping. These Are Great Accessories To Replace Your Old Or Broken Grips.2 Commonly Used Sizes: You Will Receive 16 Star Knobs, Including 8 M6 Star Knobs And 8 M8 Star Knobs. Commonly Used Sizes Are Suitable For Many Kinds Of Mechanical Equipment, Enough For Daily Use.Easy To Install: When You Want To Use These Handles, Just Cut The Threaded Rods To The Length You Need And Screw Them Into The Threaded Rods To Use. Compact Internal Threaded Knobs Very Simple To Install, No Other Tools Required.Usage: Internally Threaded Nut Clamp Knob To Hold And Secure Control Panels To Assemblies And Machinery, Can Also Be Used For Other Decorations Of Furniture. Widely Used For Mechanical Appliances, Instruments And Appliances, Food And Industrial Equipment.