👷♂Top Quality：Made from high speed steel,after professional heat treatment,HRC48~50,ensuring its high hardness and high concentricity.
👷♂Size：Packaged with 4 different size for your choose, 1/4"(6.4mm), 5/16"(8mm), 3/8"(9.5mm), 1/2"(12.7mm). These long square drill bits set can meet most of your needs, and each drills packed in a single plastic case, easy to maintain.
👷♂Efficient and labor-saving: Our woodworking squre drill bit all designed with long drill core and square chisel,easy to lock the hole on the wood, then you can get different mortisers quickly.
👷♂Widely Application: Great for drilling square holes in wood with a mortising machine or a mortising attachment.Fits all mortising machines and drill press attachments. Square hole drill is mainly used for woodworking aspects.