Square Hole Mortising Drill Bit is great for drilling square holes in wood. With Square Hole Drill Bit, you can lengthen the drilling core and increase the concentricity. Moreover, you can use the Square Hole Drill mainly for woodworking aspects. Most importantly, with these tools, you will reduce the labor intensity of construction workers, increase the construction speed and reduce the construction costs. We truly believe we make some of the most innovative products in the world, and we want to make sure we back that up with a risk-free ironclad 30 day guarantee. If you don't have a positive experience for ANY reason, we will do WHATEVER it takes to make sure you are 100% satisfied with your purchase. Buying items online can be a daunting task, so we want you to realize that there is absolute ZERO risk in buying something and trying it out. If you don't like it, no hard feelings we'll make it right We have 24/7/365 Ticket and Email Support. Please contact us if you need assistance. If you have problems with the purchase, please notify the customer service