Vier Vierkantbohrer zum Zapfenlochbohren und Bohren.

Available in 4 different sizes: 1/4" (6.35mm), 5/16" (7.94mm), 3/8" (9.5mm), and 1/2" (12.7mm). Ideal for drilling square holes in wood using a mortising machine or mortising pliers. It requires the use of a mortising machine. Manually drilling square holes requires tools such as a hand drill and hammer. The standard chip removal design makes it easy to remove sawdust, improving drilling efficiency. It reduces the workload for construction workers, speeds up construction, and lowers construction costs in the building, installation, renovation, and decoration industries.