Stanley Surform Blade Metal & Plastic 250 mm 10in STA521508 Replacement surform blades for use on all types of wood, aluminium, copper, plastics and laminates.For fitting to Stanley Surform tools taking 10in blades (except STA221124 round file). Flat surform blade for use on all types of wood, aluminium, copper, plastics, and laminates.Size. 250mm (10in). STA521508