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Square Hole Drill Bit ,12 mm 0.47 inch High-carbon steel Hollow Chisel Mortise Power Tool for Woodworkingspecification: size: 12 mm / 0.47 inchweight: 0.18kgproduct 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.