Attributes . (2) 656R 6 in 6TPI Nail-Embedded Wood Cutting Reciprocating Saw Blades, (2) 624R 6 in 24TPI Thin Metal Cutting Reciprocating Saw Blades, (2) 818R 8 in 18TPI Medium Metal Cutting Reciprocating Saw Blades, (2) 810R 8 in 10TPI General Purpose Reciprocating Saw Blade . Names