Extend your SDS-Max drill and core bits 12-1/2 in. with the Milwaukee exclusive Clip-Lok 12-1/2 in. spline adapter. Drill deeper and in tight spaces with confidence. The Clip-Lok spline adapter lets you lengthen and use SDS-Max core and drill bits in a variety of rotary hammers. The connections are designed for optimum energy transfer, so you won't lose drilling productivity. The Clip-Lok extension system lets you get more value out of your SDS-Max drill and core bits. The easy-to-use Clip-Lok connection adapter (sold separately) accommodates SDS-Max, SDS-Plus or spline shanks for a truly universal system that's compatible with all common rotary hammers. The adapter securely locks the two SDS-Max shanks (bit and extension) together for maximum versatility and strength in extensions from 12-1/2 in. to 82-1/2 in.