Features SHARPER AND HARDER: The entire drill bit is treated with high frequency quenching for heat treatment. Titanium prevents rust, and the cutting edge is hardened and honed to sharpness 6 diameter sizes: contains the sizes 6 mm (1/4 inch), 8 mm (5/16 inch), 9 mm (3/8 inch), 12 mm (1/2 inch), 16 mm (5/8 inch). 19 mm (3/4 inch); handle diameter: 6.35 mm (1/4 inch hex handle. ) 5 FLUTE 90 DEGREE COUNTERSINK: all have a 90° on the tip for sharp and precise sinking, five floods to ensure free chip flow and fast, chatter-free cutting Easy to use: 1/4 inch hex shank in the drill holder remain stable, pay attention to the correct size, first the guide hole and then the countersink Widely used: drill bits mainly used for drilling, reaming, chamfering, screwing etc. of wood. Also applies to MDF, plywood, acrylic, PVC panels and soft metals such as aluminium, copper, etc. Description: These countersinks made of high-speed steel are very sharp and durable and are used for a long time. 1/4 inch hex shank for most hand-held and stationary drills. Five flute design reduces vibration for smoother drilling and longer life. Precision ground 90 degree tip for countersinking into wooden boards or thin plastic sheets. These are six great heads of different sizes for all the different projects. Features: SHARPER AND HARDER: The entire drill bit is treated with high frequency quenching for heat treatment. Titanium prevents rust, and the cutting edge is hardened and honed to sharpness 6 diameter sizes: contains the sizes 6 mm (1/4 inch), 8 mm (5/16 inch), 9 mm (3/8 inch), 12 mm (1/2 inch), 16 mm (5/8 inch). 19 mm (3/4 inch); handle diameter: 6.35 mm (1/4 inch hex handle. ) 5 FLUTE 90 DEGREE COUNTERSINK: all have a 90° - on the tip for sharp and precise sinking, five floods to ensure free chip flow and fast, chatter-free cutting Easy to use: 1/4 inch hex shank in the drill holder remain stable, pay attention to the correct size, first the guide hole and then the countersink. Widely used: drill bits mainly used for drilling, reaming, chamfering, screwing etc. of wood. Also applies to MDF, plywood, acrylic, PVC panels and soft metals such as aluminium, copper, etc. Specifications: Material: HHS Blade: 6 mm / 0.23 inches, 8 mm / 0.31 inches, 9 mm / 0.35 inches, 13 mm / 0.51 inches, 16 mm / 0.63 inches, 19 mm / 0.75 inches. Hex shank: 6.35 mm (1/4 inch). Length: 48 mm. Flute: 5 Angle: 90°. Weight: 124g (approx.) Package includes: 6 x countersinks. Note: Monitors are calibrated differently. The whether shown in the photos Package List