3M™ Green Corps™ Hookit™ Sheet, 751U, is an aluminum oxide sheet constructed on an E-weight heavy paper backing. Resin bonded for heat resistance, this sheet is great for smooth sanding on tough surfaces. The 3M™ Hookit™ Attachment System lets operators quickly change out sheets during multi-step sanding processes. The open coat construction means that the abrasive grains are spaced so that dust and debris can collect in the spaces, rather than loading the sheet. Additionally, the open coat feature provides a more aggressive cut than a comparable closed coat abrasive of the same grade, for faster results. 3M™ Green Corps™ Hookit™ Fairing Board Sheet, 751U, features aluminum oxide blended with 3M™ Ceramic Abrasive Grain, perfect for moderate to heavy stock removal, as well as sanding and finishing applications. The ceramic aluminum oxide blend surpasses aluminum oxide abrasives in cut-rate and durability.