product description1.Easy to Drill.The tipped is sharp and wear-resistant. With high hardness and long service life. The drill sleeve has a U-shaped design to facilitate the discharge of wood chips and improve the drilling efficiency.2.Widely Applications.This square hole drill bit is suitable for wood, including particle board, channel wood, pine wood, basswood, etc. Note: It is not suitable for processing metal, glass, plastic, concrete, gypsum board etc.3. These woodworking morstising chisel bits is with high performance flute design geometry for superior chip extraction.4.These woodworking morstising chisel bits set fit mortise and drill accessories, mainly used for woodworking aspects in construction, installation, renovation, decoration industry, etc.5. Woodworking drill bit sets with long drill core and square chisel, easy to lock the hole on the wood, can reduce labor intensity of construction workers, speed up the construction speed, reduce construction costs.