BROOKFIELD ADJUSTABLE TOOL HOLDERS MODEL DA-12
RARE "mini" head with 3/4" long Shank
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Shank  3/4" X 1 1/2" long
Approx. OA   2 1/2" long x 2" x 1" -  9 oz
Bit size 1/16" TO 3/4" 
Thru hole  3/8
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Shipping weight 8x10x2 -1 lbs