Flap Discs for Grinding, Sanding & Finishing Metal We supply a range of flap discs for metal grinding, sanding, and finishing, designed for fabrication, welding, and general workshop use. Built for performance and durability, flap discs are a go-to abrasive for smoothing welds, removing material, and preparing surfaces. Available in multiple grit options, these discs give you control over material removal and finish quality — from aggressive grinding to fine finishing.