These are the single style EZ-Thumber knife thumb studs. This single stud design is one of the most secure and professional looking on the market today, and fits on many folding knife designs, especially larger, tactical folding knives.
To use this thumb stud, drill blade and attach with 6-32 flat head torx screw (included). These fit into the blade with precision, tighten up strong, and perform well! Assembly requires probe and Torx wrench.
This is a popular factory knife upgrade/replacement.
DREZTH250-S = Single Medium
.250 head x .185 step x 6-32 thread FHT (included)