Metabo 7" Variable Speed Pipe/Tube Sander Kit 13.5 AMP w/Lock-on RBE 15-180 SET PPBZ Porch Post Bases What does the "Double" designation

What does the "Double" designation mean for the HUC312-2

Cutting Length (I) 49/64"

2 driver bits (replacement bit model: BIT3SU)

and other patterns

the LUS26SS delivers high and severe corrosion resistance

Metabo 7" Variable Speed Pipe/Tube Sander Kit 13.5 AMP w/Lock-on RBE 15-180 SET PPBZ Porch Post Bases What does the "Double" designationMetabo RBE 15 180 7" Variable Speed Pipe Tube Sander Kit 1,650 5,500 ft min 13. 5 AMP w Lock on, Accessory set, Metal Carry case This Tool will ship directly from the manufacturer Powerful tube belt sander for processing even larger stainless steel pipes Large wrap angle of 270 for smooth surfaces and quick work progress Metabo Marathon motor with patented dust protection for long service life Vario Tacho Constamatic (VTC) Full Wave Electronics with