STANLEY’s original blade – the 1991 is an every-day, general purpose utility blade. • Fits all standard STANLEY utility knives and most other knives. • The 1991 blade is suitable for cutting most light sheet materials, paper and cardboard. • Fits all standard STANLEY utility knives and most other knives. • Hardened and tempered for high sharpness and long life. • Suitable for cutting most light sheet materials, paper and cardboard.