Footprint Heavy Duty Brick Bolster with grip/finger guard 4" Warrior What is the HiKOKI SDS

What is the HiKOKI SDS Plus keyless chuck adapter used for

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Footprint Heavy Duty Brick Bolster with grip/finger guard 4" Warrior What is the HiKOKI SDSFootprint Heavy Duty Brick Bolster with grip finger guard 4" Footprint Bolster Available in 4. Made in Sheffield England A carbon steel one piece drop forging, this bolster incorporates an anti mushroom head and a strengthened neck for a longer working life. Drop Hammer Forged from head to blade for superior strength Hardened and tempered blade for a long cutting life Domed head to delay the onset of mushrooming splintering after repeated use as well