3M 36221 Sandpaper Roll, 2 3 4 in W x 90 ft L, Ceramic, 180 Grit, C Wt Paper, PSA, 321U, 5 PK AX43 ASTM F3393 ASTM F3393 Maximum Drain Line Inside Diameter 6 in so they're a good choice for applications where grits aren't changed frequently and the abrasive is fully worn down before changing PSA abrasives have a sticky backing that creates a strong bond when attached to a smooth surface backing pad
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3M 36221 Sandpaper Roll, 2 3/4 in W x 90 ft L, Ceramic, 180 Grit, C Wt Paper, PSA, 321U, 5 PK AX43 ASTM F3393