Descriptions: _x005f_x000D_ This 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.The standard flute is designed to facilitate the removal of the wood chip and improve the efficiency of drilling. Exquisite blade grinding process, edge is sharper and more durable ._x005f_x000D_ _x005f_x000D_ _x005f_x000D_ _x005f_x000D_ Features: _x005f_x000D_ 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. _x005f_x000D_ Mortise and tenon square hole drilled by the terrible + outer sleeve in the middle of the combination. _x005f_x000D_ Reduce labor intensity of construction workers, speed up the construction speed, reduce construction costs for construction, installation, renovation,decoration industries. _x005f_x000D_ Exquisite blade grinding process, edge is sharper and more durable ._x005f_x000D_ _x005f_x000D_ The standard flute is designed to facilitate the removal of the wood chip and improve the efficiency of drilling. _x005f_x000D_ _x005f_x000D_ Square hole drill is mainly used for woodworking aspects. _x005f_x000D_ _x005f_x000D_ _x005f_x000D_ Specifications: _x005f_x000D_ Material: high speed steel_x005f_x000D_ _x005f_x000D_ Color: as picture shows_x005f_x000D_ Size(Optional): 10mm/16mm_x005f_x000D_ Length: 203mm(10mm diameter); 208mm(16mm diameter) _x005f_x000D_ Weight:166g_x005f_x000D_ _x005f_x000D_ _x005f_x000D_ _x005f_x000D_ Package included: _x005f_x000D_ 1 x Square hole drill