HHIP 2203-0120 - MTJNR 12-3B Turning Tool Holder - New Rigid Clamp Design Negative 3 degree lead angle. Right hand. Zero degree relief. Use with TNMA, TNMG, or TNMM 33 inserts. New rigid style top & hole clamping design provides increased stability & security for productive turning of large components and heavy machining. Shim is #2100-1603. Shim screw is #2100-4300. Clamp is #2100-2901. Clamp screw is #2100-4350. Spring is #2100-4384. Please see chart picture for sizing information. When replacing the insert, apply enough pressure to push the clamp forward and align it with the hole as you tighten it. Please see the video of the installation process.