Listing is for one 3/8" x 1-1/2" heavy duty steel J bracket. Designed to be used with common lumber sizes found at big box stores or lumber yards. Rated for 120 Ibs. Each bracket comes with four 1/4" holes. I oversize the brackets by a 1/4" for bowed walls or warped boards. All brackets are unfinished.
Many of the brackets of this style that sell on Etsy are 3/16" or 1/4" in thickness, those sizes are adequate for lighter loads but if you plan on loading your shelves with heavier items I would suggest 3/8" bracket. Sold as singles.