8pc Impact Socket Adapter Converter Reducer Set CR-MO Professional Grade w/ Case. 【What's Included?. 】 Reducer sizes include: 1"F to 3/4"M, 3/4"F to 1/2"M, 1/2"F to 3/8"M, and 3/8"F to 1/4"M. Adapter sizes include: 1/4"F to 3/8"M, 3/8"F to 1/2"M, 1/2"F to 3/4"M, and 3/4"F to 1"M.
eBay