This Blue Monster Six-In-One Brush is from Mill-Rose. It is used to clean the inside diameter (I.D.) of 1/2 inch and 3/4 inch fittings, and the outside diameter (O.D.) of 1/2 inch and 3/4 inch tubing. It has a deburring plate which reams and deburrs the I.D. of tubing. The square opening on the plate serves as a b-tank gas key and also a bottle opener. Mill-Rose part number 70255.
EC Part Number: #37969
Manufacturer Number: 70255
Manufacturer: Mill-Rose