Sherman or tool steel bottom lifters...

[Adger Smith]

Part # Description
18000 16" Aluminum Degree Wheel
16" Degree wheel is machined from 1/4" Aluminum. Degree marks are machined
approximately 1/8" apart so they’re easy to read. Heavy design allows the builder
to rotate the engine while “degreeing” the cam. Comes with 7/16", 1/2" and 5/8"
bushings.

StarMark by BAASEL Laser Tech is our latest addition of
services available to all of our customers. The StarMark
Diode is a marker beam source with diode pumped
YAG (DPY) lasers—particularly suitable for permanent
marking of plastics, metals, and high-tech materials. Ideal
for integration in production.

Mike, YAG is the same kind of Laser they use in some eye surgeries. I guess if it is good enough for your eyes it is good enough for a Degree wheel..LOL! There are wide tolerances with the Silk Screen type others use.
You can't keep the silk screen accurate.
http://www.pppcenter.com/