![]() Rotational drive uses the sliding keyways that open to the end of the shank, which mate with keys in the chuck. The hammer of the drill acts to accelerate only the drill bit itself, and not the large mass of the chuck, which makes hammer drilling with an SDS shank drill bit more productive. The drill bit is not held solidly in the chuck, but can slide back and forth like a piston it does not slip during rotation due to the non-circular shank cross-section, matching the chuck. SDS shank and chucks are made to be used for hammer drilling with masonry drills in stone and concrete. The SDS shank is simply pushed into the spring-loaded chuck without tightening. The SDS Max is larger with an 18 mm shank diameter, while the SDS Quick has a smaller 6 mm shank diameter. The diameter of a SDS Plus shank is 10 millimeters. See also: Chuck (Special Direct System) SDS-plus drill bit shank SDS-max drill bit shanks
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