M.K. Morse RB1218T50 12-by-3/4-by-.035-Inch 18 TPI Bi-metal Reciprocating Saw Blade, 50-Pack (400206)M. K. Morse RB1218T50 Master Cobalt Metal Recips 12 Length x 3 4 Width x . 035 Thickness 18 Teeth Per Inch Morse Master Cobalt Metal Reciprocating Saw Blade: . 035" thickness for flexibility in tight spaces. . 050" thickness for increased rigidity and heavier feed pressure. 3 4" width provides flexibility. 1" width provides rigidity and beam strength. Reinforced tooth design with compound relief provides high impact resistance. More aggressive cutting