Designed for use with Milwaukee Shockwave magnetic bit tip holders. Proprietary steel and heat treat process for maximum strength and durability. Heavy-duty construction for fastening capabilities in all impacts. No. 48-32-5020: Input Drive: 1/4" Hex, Output Drive: 1/4" Square, Length: 1-1/2", Pkg Qty: 1, Package Type: Card No. 48-32-5021: Input Drive: 1/4" Hex, Output Drive: 3/8" Square, Length: 1-1/2", Pkg Qty: 1, Package Type: Card No. 48-32-5022: Input Drive: 1/4" Hex, Output Drive: 1/2" Square, Length: 1-1/2", Pkg Qty: 1, Package Type: Card