Here are silent diamond chisel tool, we developed them and improved them a lot, please look at the picture, it is so much better than ELLE Japan, the teeth can clenched neatly.
The material is steel, the handle has good hydroscopic property.
This is very important tool for making such as clutch, some places is very hard to shoot holes by normal chisel, then you need it too make holes.
At night, nothing is better than make holes without noise :)
The 3mm one, tooth width is 1.5mm;
The 4mm one, tooth width is 2mm;
The 5mm one, tooth width is 2.5mm;
The total lenght is about 17cm, The largest openting is about 1cm.
Notice: Don't clench the handle without leather.