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. suitable for soft metal, woodworking, home improvement, DIY lovers etc; 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 and CHATTER - the final straighten process is added before shipping from the factory. 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 than common rolled drill bits. excellent chip removal and heat removal; WHAT YOU GET - combo set of 13pcs, 13 most commonly-used sizes (1/16",5/64",3/32",7/64",1/8",9/64",5/32",11/64",3/16",13/64",7/32",15/64",1/4") to satisfy all needs.