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Different depths include 1/8, 1/4, 5/16, 3/8, 7/16, and 1/2 inch. Legend below explains sizing. Select your item(s) then click Add to Cart. Legend (in inches unless otherwise noted): SHK = Shank Size Technical Info Blue Tornado brand router bit sets and shaper cutters are a great value for woodworkers! Manufactured by ValueMax Tools, their standards include the highest quality extra-thick micro-grain carbide and high-strength heat-treated steel shanks for safety in preventing bending or breaking. See the link below for more detail.