Interchangeable carbide scribing drill mounted in the holder
Rigid heat-treated tool steel holder
Designed with spring system to retract drill for uneven surface
Extra function to use chamfer milling for hole edge
TiN coated 90 degree drill point with dual angle for stable scribing
Carbide flatted shank drill to fit in STH holder
Locking by side screws fastening
Adjustable tension by threaded screw from holder end

How to assemble scribing tool
A. Push ① SD 080, Scribing tool into tool body until hiding flatted shank  completely
B. Lock ② Locking screw completely
C. Insert ③ Tension SHT-spring inside of tool body
D. Turn ④ Adjustment screw right-hand direction and push into the holder-end
E. Finally, loose ② Locking screw by 45” left-hand direction(about 1/8 turn) so that spring’s tension can be performed