Marksman 12 piece SDS Drill Bit Set in Wooden Case 58065C

An ideal drill set for those slightly larger jobs

• Included within this wooden boxed set of SDS drill bits are:
• 9 x drill bits: 5, 6 x 110mm - 8, 10, 12 x 160mm - 14 x 200mm - 16 x 210mm - 18 x 300mm - 20 x 450mm
• 3 x chisel bits: 14 x 250mm point chisel - 14 x 250 x 20mm flat chisel - 14 x 250mm U groove chisel
• Wooden case dimensions: Length 480mm x Width 162mm x Depth 65mm

The SDS drills shank into a simple spring-loaded chuck, so that bits can be chucked with a simple and quick hand action. the easiest drill bits to change, the shank and chuck are uniquely suited to hammer drilling in stone and concrete. The drill bit is not held solidly in the chuck, but can slide back and forth like a piston. 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 much more productive than with other types of shank. So, SDS shanks are most often seen on masonry drills, for which hammer drilling action is most helpful.

Rotational drive uses the sliding keyways that open to the end of the shank, which mate with keys in the chuck. The smaller indentations that do not open to the end are grasped by the chuck to prevent the drill bit falling out. The hammer of the drill hits the flat end of the shank. To allow the bit shank to slide in the chuck, the shank must be lubricated with grease.

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