Spyder's jig saw blades are ideal for tough cutting tasks that require the clean curve or straightest linear cuts in wood and metal. Bi-metal blades resist heat build-up for exceptional durability in tough cuts in metals, and chrome vanadium blades make clean curve and straight cuts in wood. 10pc set in storage case includes: BiM blades -- fine tooth (2x), coarse tooth TPI (1x); CrV blades -- Skeleton clean cut (1x), double-sided curve cut (1x), fast curve cut (2x), fast straight cut (2x), straight clean cut (1x).