Thumb Screws 1.Knurled head Thumb Screw 2.Steel,brass,Al thrumb ... :M2-M6 screw 4.Free samples for thumb screw Thumb Screws 1. Head type of thumb screw:KINDS OF HEAD,KNURLED2 ... , Zinc plated (Galv), Nickel, phosphate black, 3Cr zinc,Passivation8. Packing :General packing: 15-20Kg per Carbon or Bag, approx 36-60 ... THUMB SCREW based on your requirs or print drawing....... Thumb Screws