Eclipse Plus 30 'All Hard' Hacksaw Blade - 10" x 1/2" x 24 tpi - pretty much the best you'll find on the planet?
"A rigid, All Hard ground blade, for highly accurate cutting and long life. The All Hard blade is manufactured entirely from top quality M2 High Speed Steel, each blade is precisely hardened throughout its entire width to give a strong, rigid back, ensuring a perfectly straight cut time after time. For the best performance from All Hard blades, the workpiece should be securely held in a clamp or vice to prevent shattering of the blade and safety goggles should be worn. The unique ground tooth profile of the Plus 30 blade produces a faster and more aggressive cutting action that requires less effort and is more efficient than a standard blade."