The expander set is fast and easy to operate. With the excellent cooperation of an impact driver and patented ruler, you can easily achieve a square or round hole on a metal sheet. Each set includes 2 square dies and 4 round dies, which can be applied to most sizes.
Every kit includes:
1 Hole Expander
1 Bit Holder (to connect impact driver)
1 Fixing cap
2 square die molds-33.5*33.5mm & 45*45mm
4 round die molds-22、27.5、30、34.3mm
