Features: Drill bit is made from high speed steel and countersink is made from good quality 45# steel which ensures a long service life. Combined drill bit and countersink bit is great for drilling, chamfering, deburring and countersinking. There are 7 different sizes that meet you various need. Drilling length can be adjusted for various length screws simply by loosening and tightening the setscrew. Suitable for drilling holes on board of low hardness such as wood, plastic and other soft material. Specification: Material: High Speed Steel (drill bit), 45# Steel (countersink) Cutting Edge Diameter: 1/8", 9/64", 5/32", 11/64", 3/16", 13/64", 7/32" Color: Black Weight: Approx. 291g Package List: 7 x Countersink Drill Bits 1 x Wood Box Note: The electric drill is NOT included. 1、Drill bit is made from high speed steel and countersink is made from good quality 45# steel which ensures a long service life 2、Combined drill bit and countersink bit is great for drilling, chamfering, deburring and countersinking 3、There are 7 different sizes that meet you various need 4、Drilling length can be adjusted for various length screws simply by loosening and tightening the setscrew 5、Suitable for drilling holes on board of low hardness such as wood, plastic and other soft material