The Milwaukee Shockwave 45-piece Impact Driver Bit Set is engineered to be the Most Durable, Best Fitting driver bits on the market. The Wear Guard Tip delivers increased wear resistance which protects the impact bit's fit over the life of the bit. The Shockzone is optimized for each tip type and length of driver bit in the set to absorb peak torque and prevent breaking. The driver bits have Custom Alloy76 for a customized steel and heat treatment per tip type to extend the life of the user's driver bits, providing up to 50X life versus other impact driver bits on the market. The Milwaukee Shockwave driver bits are built to provide users with extreme durability for the most demanding applications. The Milwaukee 21-piece Thunderbolt Black Oxide Drill Bit Set offers convenience and heavy-duty performance on the job site. These drill bits are designed for extreme durability and long-life. The Thunderbolt web features a thicker core to provide ultimate strength and protect against side-load breakage. Corrosion resistant coating provides lubricity and resists the corrosion of the tip. A specially designed parabolic flute form clears chips fast, while the 3-Flat Secure-Grip shank holds the drill bit firmly in the drill chuck. T The set comes in a durable carry case and includes bit sizes two 1/16 in., two 5/64 in., 3/32 in., 7/64 in., two 1/8 in., 9/64 in., 5/32 in., 11/64 in., two 3/16 in., 13/64 in., 7/32 in., 15/64 in., two 1/4 in., 5/16 in., 3/8 in. and 1/2 in.