Micrometer heads will vary slightly depending on the supply company which is supplying them. However, the typical selection of micrometer heads available includes digimatic heads, standard heads, high function heads, and specially designed heads. Some of the subtypes include non-rotating spindles, quick-operating, fine-adjustment, and locking-screw designs. In terms of other design features, micrometer heads will vary depending on the measurement range, the stem type, and the body size. Overall, the factors on a micrometer head will vary by range, graduation, stem, spindle face, resolution, and thimble diameter. Some of these design features are widely applicable and may be ideal for more general use of a micrometer head. However, for specialized jobs, you may need to use features that are intended for those certain precision measurement needs, but not others.