Triple the life of standard reciprocating saw blades, Master Cobalt technology has aunique combination of features resulting in the longest lasting recip blades available.They cut smooth, accurate, and offer great value.Features & BenefitsPremium bi-metal recipblade product Wide variety of sizes for everyprofessional cutting need Available in 3 different thicknessesto meet flexibility and stiffnessneeds for various applications Master Cobalt ReciprocatingSaw Blades have conventional shanks.