This dual kwik-tite wrench is from Jones Stephens, model J40490. It makes installing stops very easy. The larger wrench measures at 1-1/16" ID x 1-5/8" OD, where the smaller wrench measures at 11/16" ID x 1-1/8" OD. It can also tighten 3/8" supply nuts.
EC Part Number: #35344
Mfg No.: J40490
Mfg: Jones Stephens