説明

• Features: High hardness, unique stepped structure, a drill can open a variety of size aperture. Suitable for these work-pieces that hardness is lower than 25 degree and the thickness is beyond 4mm, such as aluminum parts, insulation board, PVC plate, etc. The central punch is not needed, small shaking, hard to be broken. Used with pistol drill or bench drill, water it to cool while working to prolong its life, the proper drilling speed is 250-400 rpm. Special step design, one drill for many sizes, very convenient. Specifications: Material: HSS 4241 Shank: hex shank Shank diameter: 6mm Groove: spiral Surface treatment: Nitriding black Step quantities Step diameter Net weight 5 steps 4, 6, 8, 10, 12mm approx. 20g 9 steps 4, 6, 8, 10, 12, 14, 16, 18, 20mm approx. 42g 15 steps 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32mm approx. 137g Note: Please allow 1-3mm error due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item.

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