ST-7221A Double Rows Multi-Boring Machine 1.Spindle distance 32mm 2 Spindle Number: 21X2bits 3.Max drilling depeth 50mm ST-7221A Double Rows ... , flakeboard, medium density fiberboard, etc. This machine has such advantages as high production efficiency, easy operation, processed precision, etc., and drill holes ... 2840rpm 8) Compressed air work pressure 0.6MPa ST-7221A Double Rows Multi-Boring Machine