Kendall Howard Rackmount Flat Spacer Blank, 1U The Kendall Howard series of Spacer Blanks is a cut above the rest More important than just looks is the added strength that each rack mounted component you install ad Some racks can experience more than twice the strength and ruggedness by simply installing Spacer Bl We recommend installing either a component or spacer blank at least every 8U Spaces (17.5" for racks Spacer Blanks are constructed from heavy 14-gauge steel and individually formed by coining each bend