Steel Dragon Tools® Variable Speed Mini Milling Machine Benchtop Drilling by | Jul 5, 2026Drilling Capacity: 3/8″. Designed for drilling, deep milling and face milling. Spindle Speed: Low: 0~1000 RPM High: 0~2000 RPM. The set includes 1/8″, 3/16″, 1/4″, 5/16″, 3/8″, and 5/32″ size cutters.