4-16.5mm HSS Step Drill Bit High Speed Steel Triangular Handle Spiral Groove Step Drill Bit

Specifications:  Color: Silver(as picture shown);  Material: High Speed Steel;  Size: Approx. 122 X 98 X 12mm;  Steps (7 steps): 4 / 6 / 8 / 10 / 12 / 14 /16.5mm;  Shank Diameter: 12mm;  Scop: Thin iron plate,aluminum, PVC panels.     Features:  - High speed steel, durable.  - Multiple gauge aperture.  - Widely used, deburring, chamfering, open round hole.  - Processing range: aluminum, iron, ordinary steel plate, thickness less than 5 mm (can be used for bench drills)     Package Included:  1 x Step Drill     Note:  It is necessary to cool the drill bit during operation, water injection, cutting fluid can be used, otherwise it will affect the service life of the drill bit, even if it is burned, the drill bit will be scrapped!