1. 1/2" UNCSKU: 0751. 1/2" UNC Hand / Machine Tap 1st Cut / Taper Tap 6 tpi Standard UNC pitch 170mm Overall, 60mm Cutting Length, 28mm Shank and 22mm Square Drive. 4 Flutes, Centred Both Ends.ShippingFree UK Shipping. £38.00PriceQuantity*Add to Cart