Comparison : Item # SD3-7100B(drill only), Stand Type Unit - Standrill for Multiple Way
Item # SD3-1650B, 7/16 Inch (in) Aluminum Drill Size (ADC) Stand Type Unit - Standrill for Multiple Way
Item # SD3P-1630B, Stand Type Unit - Standrill for Multiple Way
Item # SD3P-1620B, Stand Type Unit - Standrill for Multiple Way