Cheap And Discounts 2PCS Shank Diameter 0.19'' Thread diameter 1/4" High Hardness Spiral Tap set for metal hand drill tool black silver Nitriding Wholesale. Buy Directly From Merchant CHEERBRIGHT CHEE Store. Enjoy ✓Free Shipping Worldwide! ✓90 Days Buyer Protection. ✓Easy Return. ✓Money Back Guarantee.