1. Velcro Type Aluminium Oxide Sanding Disc With Holes For Vacuum Extraction, Grit 40, Size 150 Mm (6) X 6 Holes. Specification Is: 715:2002, Rev.4, Amendment No.1 October 2004. 2. Velcro Type Aluminium Oxide Sanding Disc With Holes For Vacuum Extraction, Grit 60, Size 150 Mm (6) X 6 Holes. Specification Is: 715:2002, Rev.4, Amendment No.1 October 2004.