Thunbscrews for the M2.5 Adjustment Screws such as those found on the Anycubic Delta Kossel K2.
These Thumbscrews index to the fixed timing belt and have 9 ticks where 1 tick = .05mm. Allows for precise adjustment with out tools.
Standard M2.5 screws have a pitch of 0.45mm per mm hence the 9 notches for .05mm accuracy.
Up and down versions included w/ 1/4" hex pattern for griping the part while driving the screws in. (Believe me you need it.)
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THUMBSCREWS INDEX TO THE TIMING BELT
The notches prevent the knob from tightening or loosening and give you confidence your adjustment was correct.