The Corner Punches is available in 6 sizes. Arc of the punch is quarter of a circle.
Solid stainless steel handle has a good heft to it, weighted handle prevent shifting when in use. The Blade was heat treatment  and can keep the sharp long lasting.
Nylon hammer and poundo board are recommended to use with these punches.
 
R= Round size
1) R = 5.0 mm = 0.2 inch 
2) R = 7.25 mm =0.29 inch
3) R = 10.0 mm =0.39 inch 
4) R = 12.5 mm = 0.51 inch
5) R = 15.0 mm = 0.59 inch 
6) R = 20.0 mm = 0.79 inch 
 
Manufacture : designed and made by 157 Store in VietNam