Threaded Spindle, Rotating thimble (drum) with markings, mechanical counter or key or grub screws for digit type micrometers, LCD display & PCB circuit board for Digimatic micrometers, blades for blade micrometers (or external groove micrometer) & crimp height micrometers, flanges or discs for flange (disc) micrometers & many more.Lock assembly, Ratchet stop, interchangeable anvils for adjustable micrometers or screw thread micrometers or gear tooth micrometers, Battery cells (SR44, LR44, CR2032) & Battery cell covers for digimatic micrometers & many more