Features Hex shank size 1/4" and includes six sizes of 6mm, 8mm, 9mm, 12mm, 16mm, 19mm. Suitable for low hardness boards such as wood, plastic and other soft materials. Cannot be used for metal. Ideal for chamfering, deburring and lowering. Five flute design ensures low chip load and faster removal The countersinks are made of high quality high-strength steel, which ensures a long service life. Can discharge wood sawdust faster and more smoothly during use. Description: These high-strength steel countersinks are very durable and you can use them for a long time. The 1/4 inch hex shank fits most hand-held and stationary drills. The five-groove design reduces vibration for more uniform drilling and longer life for all the different projects. Specifications: Material: HHS Blade: 6 mm/0.23 inches, 8 mm/0.31 inches, 9 mm/0.35 inches, 12 mm/0.47 inches, 16 mm/0.63 inches, 19 mm/0.75 inches. Hex shank: 6.35 mm (1/4 inch). Length: 48 mm/1.89 inches. Flute: 5 Angle: 90° Weight: 124g (approx.) Package includes: 6 x countersinks. Note: Monitors are not calibrated same, the colour of the item shown in the photos may differ slightly from the actual object. Please take the real one as standard. Package List