Item Type: Tap drill bit set Material: Steel Size: 1/8in, 5/32in, 3/16in, 1/4in, 5/16in, 3/8in Shank: 1/4in Note: 1. Manual measuring, please allow 1-3mm error, thank you. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 1Multi Functional: The tap drill bits are capable of drilling, tapping, and chamfering. Ideal for all your drilling and tapping needs. 2Durable Material: Made of high speed 4341 steel, these tap drill bits promise higher hardness and durability in regular operation. 3Versatile Use: They are primarily adequate for tapping soft metal such as an aluminum plate of 3?4mm thickness. 4Six Different Sizes: This set includes six different sizes of drill bits: 1/8in, 5/32in, 3/16in, 1/4in, 5/16in, 3/8in, suitable for various operations. 5Reliable Design: Featuring a 1/4in hex shank which fit into all power tools more easily and securely, especially for lock in quick chucks.6 x Tap Drill Bit