Material: high speed steel Drill size: 3mm,4mm,5mm,6mm,7mm,8mm,10mm Chamfer diameter: 15.8mm Dimensions: 3mm (diameter) x 60mm (length); 4mm (diameter) x 75mm (length); 5mm (diameter) x 85mm (length); 6mm (diameter) x 93mm (length); 7mm (diameter) x 100mm (length) ); 8mm (diameter) x 110mm (length); 10mm (diameter) x 120mm (length) Color: silver Quantity: 7 pieces Package content: 7 pieces * Woodworking countersunk drill reamer 1. [Material]: 2-in-1 countersink bits are made of high speed steel,quenching treatment,so they are high hardness,wear-resistant and durable. 2. [Three-point drill design]: The countersink cutting flutes are made of gear grinding,the three-point drill is better centered and does not slip,so drilling is precise and fast with high efficiency. 3. [Flexibility,Detachable and Adjustable]: It is convenient to use the combination of hex wrench to adjust or dismantle the countersink and five-flute chamfer. 4. [Fast Chip Removal]: The wide chip slot and five-edged chamfer speed up the machining process to remove the sawdust,and the chamfer is smoother and more uninterrupted. 5. [Round handle design]: The handle is smooth without friction with the machine and is suitable for power bank or hand drill in the most common sizes.