【MATERIAL】- Made from 45# Steel for high hardness and durable to use. 【SIZE】- 150# grommet setter for grommets of inner diameter 4mm. 【FEATURE】- Practical grommet punch tool is very essential equipment for dress makers, artists, craftsmen, sign shops and clothes manufacturers, etc. It is easy to use no matter you are a professional or novice. 【ADVANTAGE】- Grommet punch with comfortable handle is easy to use and carry. 【APPLICATION】- Perfect grommet punch or rivet setter tool for making or repairing leather craft, clothing, handbags, curtain, jacket, etc.