Eclipse AE45B/10 All Hard High Speed Steel Hacksaw Blade, 12" x 1/2", 18 Teeth per Inch (Pack of 10) All hard high speed steel, 12Long x 1/2wide x 0.025 thickness; 18 teeth per inch Blade is a rigid all hard blade for highly accurate cutting and a long life Manufactured entirely from top quality high speed steel, it cuts through all types of alloys and stainless steels Each blade is precisely hardened throughout its entire width to give a strong rigid back, ensuring a perfectly straight cut time after time For best performance, the workpiece should be clamped to prevent shattering of the blade