6-48 tpi and 8-40 tpi 6 Piece High Carbon Steel Tap Set with Cobalt Drill Bit 769272680074 | eBay
Tap Drill Chart | PDF | Drill | Screw
Amazon.co.jp: UNC UNF UNEFUN Right Screw Tap and Die Set 2pcs HSS Hand Tap Drill Bit 5/163/8 7/16 1/2 5/8 3/4-18 20 24 28 40-UNF 1l2-20 : DIY, Tools & Garden