HHIP MSDNN 12-4b Turning Tool Holder - New Rigid Clamp Design 45 Degree lead angle. Neutral hand. Zero degree relief.Use with SNMA, SNMG, or SNMM 43 inserts. New rigid style top & hole clamping design provides increased stability & security for productive turning of large components and heavy machining. Shim is #2100-1205. Shim screw is #2100-4303. Clamp is #2100-2902. Clamp screw is #2100-4353. Spring is #2100-4384. 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