Generic 6pcs Square Hole Mortise Chisel Drill Bit Tools, 5/8″ 9/16″ 1/2″ 3/8″ 5/16″ 1/4″ HSS Woodworking

Clamping shank diameter: 19mm (Round)
Professional wood drill, suitable for construction, installation, decoration, decoration and other industries.
Note:
Square hole drill can not use electric drill, drill square hole need to cooperate with square hole drill (mortise and tenon) use. before you buy it, please kindly check whether it suits your needs.thank you!