Light duty use with those only. I hate 'em because they don't nest the insert and rely upon one surface and the screw for insert security and stability.
Triangular insert have really started to fade in popularity because they can really only work for single direction turning, while a W or C can be used for turning and facing without reorienting the holder. The tips are notoriously weak too, as you may have found.
/rant
Anyhow, you can also use TPGT, TPMT or TPMW in 321 (.015" corner rad), 322 (.031"), 320.5 (.008"), as long as the counter sink matches the head of the screw within reason.
EDIT: Aw crap, I have to correct myself. Those holders appear to use a much shallower side clearance angle that the 11º of a TPxx. Go with the ones Jack linked to, as they appear to be a 5º or less clearance angle. Plus, there doesn't appear to be many TPxx in a 32x thickness. Most are a 32.5x (.093-.098 thick.)
Triangular insert have really started to fade in popularity because they can really only work for single direction turning, while a W or C can be used for turning and facing without reorienting the holder. The tips are notoriously weak too, as you may have found.
/rant
Anyhow, you can also use TPGT, TPMT or TPMW in 321 (.015" corner rad), 322 (.031"), 320.5 (.008"), as long as the counter sink matches the head of the screw within reason.
EDIT: Aw crap, I have to correct myself. Those holders appear to use a much shallower side clearance angle that the 11º of a TPxx. Go with the ones Jack linked to, as they appear to be a 5º or less clearance angle. Plus, there doesn't appear to be many TPxx in a 32x thickness. Most are a 32.5x (.093-.098 thick.)