Diablo DS1214AFC5 Reciprocating Saw Blade, 10/14 TPI, Bi-Metal, Perma-Shield | Diablo's Bi-metal reciprocating saw blades provide the best cutting performance on the market. Perma-shield coating protects these blades from heat, gumming and corrosion. Patented aggressor variable tooth technology incorporates a tooth count per inch (TPI) that drastically increases from the shank of the blade to the tip allowing for super-fast cuts with less vibration.