These countersinks, made of high speed steel, are very sharp and durable and you use them for a long time. 1/4" hex shank fits most handheld and stationary drills. Five flute design reduces vibration for smoother drilling and extended life. Precision-ground 90 degree tip for countersinking into wood plate or thin plastic plat. They are six different size heads which are great for all the different projects. Features: Countersinks are made from good quality high speed steel which ensures a long service life. Hex shank size 1/4" (6.35mm) and includes six cutter sizes of 6mm, 8mm, 9mm, 13mm, 16mm, 19mm. Ideal for chamfering, deburring and countersinking. Five flutes design provides small chip loads and quicker removal. Can discharge wood sawdust more rapidly and smoothly in the process of using. Suitable for board of low hardness such as wood, plastic and other soft material. Cannot be used for metal.
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