The Milwaukeer SDS Plus to Chuck Adapter Kit lets you use straight shank twist bits in your rotary hammer for greater productivity. The kit includes a 1/2" all-metal, three-jawed chuck (48-66-1360), an SDS to 1/2-20 thread chuck adapter (48-03-3005), a chuck key (48-66-3280) and chuck screw (06-75-3150). Increase the usefulness of your rotary hammer by using straight shank twist bits in a "drill only" mode.