This makes the 1 x 42 size one of the most common belt sizes for knife making for profiling, bevel grinding, detailed edge sanding, and sharpening. J Flex refers to an even greater flexible backing material that is often used without a contact wheel and some slack in the belt so it can softly contour rounder shapes (e.g.a wooden handle). Mix Grit – 12 Pack: Includes 80 / 120 / 150 grit – ideal for everything from heavy removal to fine finishing. Typically various 'X' and 'Y' weight backings are used in metal working as the standard. sharpening or detailed handle work. KEYSTONE HIGH QUALITY 1 X 42 SANDING BELT ASS'T GRIT (12 PACK... Available in 60x, 80x, 120x, 150x & 220x (EACH 5 PACK SOLD SEPARATELY). USD$ 5. Price when... 1 x 42 Sanding BeltThese are some of our most popular materials, but Keystone Abrasives has available many different materials. If you do not see your material please contact us 12 pack assortment of 2ea; 60x, 80x,100x, 120x,150x,220x 1x42 Sanding Belts Keystonehigh Quality 1 X 42 Sanding Belt Asst Grit 12 Keystone Abrasives Antistatic, washable plus an additive in the resin to resist loading. WHY 1 X 42 SANDING BELTS? 1 x 42 sanding belts lean toward the finer details and work that blades can require—e.g. Made with special open coat A/O grain & strong X weight poly cotton backing. Sanding Belts 1 x 42 Sander Belts Cloth Zirconia (12 Pack, 100 Grit