Roman Carbide DC1820 1/4-Inch Shank Jig Set, 5-Piece 1/4-Inch Straight Bit (Carbide Tipped) 3/8-Inch straight bit (carbide tipped) 1/4-Inch dovetail 7 Degree bit (special tool steel) 3/8-Inch dovetail 8 degrees bit (carbide tipped) 1/2-Inch dovetail 14 Degree bit (carbide tipped)