Amoolo Hex Shank Drill Bit Set, 16Pcs Titanium Hss Twist Impact, 1/16?-3/8? Wide Applications - compatible with power screwdrivers, impact drivers, and other tools that accept 1/4" hex shanks, allowing for quick changing between multiple drill bits and screwdriver bits with just one power tool; Upgraded Structure - press in pin connection makes the bit and hex shank an integrated structure to prevent break off during drilling, greatly reduced the risk of drill bit snapped off from the hex drive; Eliminates Wobbling Chatter - the final straighten process is added. which keep the bit in a straight line during rotation and reduce chatter; Designed Bladepoint - these bits with a 135 split point keep centered without a pilot hole, full-ground body drill faster with fewer defects. excellent chip removal and heat removal; What you Get - combo set of 16 pcs, 12 most commonly-used sizes (1/16",5/64",3/32",7/64",1/8",9/64",5/32",3/16",7/32",1/4",5/16",3/8") to satisfy all needs, additional piece of 1/16", 5/64", 3/32" and 1/8"for easy replacement. total 16 Pcs hex shank twist drill bit set come with a portable plastic case for easy select, storage and carry.