Quick Change Hex Shank: 12mm, 16mm and 19mm, all with a hex quick change hex shank for easy quick change with a 1/4 quick release system (Please receive promo code on product page when ordering purchase for a lower price.) Heat treatment: general high co.ukequency quenching, increased hardness Function: Ideal for making 90 degree holes in wood and soft metals for preparation of countersunk screws and fasteners. Use: Cuts quickly and easily in soft metal, wood, rubber, plastic and other machinable materials Application: Suitable for carpentry, locksmiths, automotive and metalworking. All commonly used sizes including 12mm, 16mm and 19mm When you complete a pilot hole with a countersink, the screw head sits perfectly. It is made of high speed steel with five flutes. Heat treated carbon steel blades ensure long tool life. carpentry, locksmith, automobile, metalworking Area of application: This product is suitable for chamfering low hardness plates such as wood and plastic plates. Do not