C.R. LAURENCE CRL4X106120X CRL 4" x 106" 120X Grit Wet Abrasive Belts for Upright Belt Sanders - 5/Bx. Wet Abrasive Glass Grinding Belts have a 100 percent polyester backing so you can use them wet or dry. Available in six standard sizes in grits from 36X (Super Coarse) to CORK (Polishing) to fit most any upright belt sanding machine. All Upright Sander Belts come five belts per box, unless otherwise marked. Cork Polishing belts are also available. If you don"t see your belt size or grit here, contact CRL Glass and Glazing Technical Sales.. Part Numbers Variations: CRL4X106120X