��【Purchase Notes】The square hole drill bits need to be used in conjunction with the mortise machine.Please make sure that the wood borad and the drill are at a 90 degree angle. These drill bits not usable with a hand held drill.

��【Easy to Drill】The carbide drill bit 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.

��【Widely Applications】This square hole drill bit is suitable for wood, including MDF, MDF, particle board, channel wood, pine wood, basswood, etc. Note: It is not suitable for processing metal, glass, plastic, concrete, gypsum board etc.