Description:【Material】: Woodworking Drill Tools is made of carbon steel, high hardness, strong and durable

Heat treatment, high hardness, lengthened core, high concentricity, long life using

【Convenient Chip Removal】: Auger Mortising Chisel Drill has a standard chip removal design, which can easily remove the side of wood chips and improve drilling efficiency【Advantage】: Wood Drill Bit Set reduce the labor intensity of construction workers, accelerate the construction speed, reduce the construction cost of construction, installation, decoration, decoration industry

【Wide Application】: Square hole drill bits fits all mortising machines and drill press attachments

Square hole drill is mainly used for woodworking aspects

【Size】: Come with 4 different size for you

Square hole, 1/4"(6

4mm), 5/16"(8mm), 3/8"(9

5mm), 1/2"(12

7mm)

Size Chart:Round Core Drilling Package Size: 4cmx4cmx22cm/1

57inchx1

57inchx8

66inchSquare Drilling Shell Package Size: 15cmx3cmx12cm/5

91inchx1

18inchx4

72inchPackage Includes:Optional Package4 Round Core Drillingor4 Square Drilling ShellNote:Please allow slightly errors due to manual measurement and different monitors