https://www.mccoys.com/shop/p/0452136-052303-32/weiler-36421-brush-adapter
36421 Brush Adapter
Sku: 0452136-052303-32
$4.86
10 Available at
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Drilling Tool Parts:Weiler 36421
Weiler Brush Adapter, Specifications: 1/2 in Arbor to 1/4 in Shank, 4500 rpm
Specifications
1/2 in Arbor to 1/4 in Shank, 4500 rpm