Cheap And Discounts Silk attack tapping bit m2.5 m3 M4 M5 M6 M8 M10 M12 M14 M16 M18 M20 ex-pot ex-sft tapping bit for tip screw machine Spiral tap Wholesale. Buy Directly From Merchant 24H Store. Enjoy ✓Free Shipping Worldwide! ✓90 Days Buyer Protection. ✓Easy Return. ✓Money Back Guarantee.