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Square Hole Drill Bit ,3/8"" 9.5 mm 0.37 inch High-carbon steel Hollow Chisel Mortise Power Tool for Woodworkingspecification: size: 9.5 mm / 3/8 inch /0.25 inchGrooving depth: 53mm / 2.09 inchHolder Diameter: 19 mm / 0.75 inchShank Diameter: 6.82 mm / 0.27 inchTotal Length: 210 mm / 8.27 inchSquare hole diameter: 9.5 mm/0.37 inchNet weight: 0.17kgproduct details:1.Square hole drillMade of high-carbon steel,through heat treatment , HRC48-50 (high hardness)2.Drill coreHigh carbon steel, precision manufacturing, Durable and unbreakable3.Drill sleeveThe drill sleeve entrance with radians is square hole drill the standard design,which greatly reduces the resistance of the drill sleeve.4.Chip FluteU-long chip flute design is convenient for the discharge of wood chips and improves drilling efficiency, widened chip removal and smooth inner wall, resulting in greater chip removal5.Compatible shank typeThe tail of the drill bit adopts a circular design, which makes the clamping more stable. It can be used with square hole drills and square tenon machines.Scope of application:suitable for wood products such as MDF, particle board, compressed version, plastic, wood (sandalwood, pine, ash, beech), etc., not for metal, glass, concrete, gypsum board material processing.Applicable equipment:suitable for square hole drills and mortise tenon machine, not for hand drills, bench drills, etc.Kindly Reminder:If you don’t have a square hole drill and a mortise machine.Conside hand drills When using a hand electric drill, Drilling requires four steps.<1> Drill first with a hand drill with a drill core<2> Adjust depth, drilling and shape<3> Beat with a Square Hole Drill Bit (note that be slow when striking)<4> Square hole forming