4 шт. сверло квадратное отверстие высокоуглеродистой из высокопрочной стали профессиональные Rustproof аксессуары шнек долото DIY инструмент Mortiser использование

Description:
Square hole drill can not be used on an electric drill, drill square holes need to fit a square hole drill drilling (mortise and tenon machine) to use.
Mortise and tenon square hole drilled by the terrible outer sleeve in the middle of the combination.
Reduce labor intensity of construction workers, speed up the construction speed, reduce construction costs for construction, installation, renovation, decoration industries.
Long service time and so durable.
Simple to use,Professional and very practical.
Specification:
Material:high-carbon steel
Color:as pictures shown
Quantity:4pcs
Size:1/4"(6.35mm)、5/16"(7.94mm)、3/8"(9.5mm)、1/2"(12.7mm)。
Package Includes:
4pcs*Woodworking Square Hole Drill
Note:
1. Due to the light and screen difference, the item's color may be slightly different from the pictures.
2. Please allow 1-2 cm differences due to manual measurement.