240 Pcs 22 Sizes Black Set Screw Assortment Kit, SAE Allen Head Grub Screws for
#4-40, #6-32, #8-32, #10-24, 1/4-20, 5/16-18. 1 – Standard size (Tolerance:±0.005mm): Uniform force, located in the center of the head with no offset, not easy to slip; Uniform pitch, obvious screw thread, no residual burrs, the set screw threads will be able to get a good grip.