Feature●?4 size can make the hole different size●?The whole drill is heat treated,offering higher hardness.●?Partial black oxide treatment prevent rusty and provide beautiful appearance.●?High-speed steel tools are good for most general purpose applications●?offering a combination of hardness and toughness for wear resistance●?The length is longer than the normal oneDescription
4Pc 1/2, 3/8, 5/16, 1/4-Inch Woodworking Square Hole Drill Bits Wood Saw Mortising Chisel Cutter Tool Set