Sipery 60Pcs Sanding Discs 4 inch Aluminum Oxide Hook and Loop Sanding Pads 60/80/120/240/320/600 Grit Sandpaper industrial_Oct2022 the blue thread on both

the blue thread on both sides is 1/4 inch from the center of the line

and spider veins

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Sipery 60Pcs Sanding Discs 4 inch Aluminum Oxide Hook and Loop Sanding Pads 60/80/120/240/320/600 Grit Sandpaper industrial_Oct2022 the blue thread on bothSipery 60Pcs Sanding Discs 4 inch Aluminum Oxide Hook and Loop Sanding Pads 60 80 120 240 320 600 Grit Sandpaper Specification Quantity: 60Pcs 4 inch Sanding Discs Material: Aluminum oxide abrasive Color: Red Sanding Discs Adhesive Type: Velvet backing Sandpaper Diameter: 100mm 4inch Package include: 10Pcs 60 grit sanding discs 10Pcs 80 grit sanding discs 10Pcs 120 grit sanding discs 10Pcs 240 grit sanding discs 10Pcs 320 grit sanding discs 10Pcs 600