Sturdy supports won't bend under pressure and are suitable for wood, metal and laminate shelvingBook support is stamped out of 20-gauge rolled steel and hand buffed to produce smooth, rounded edges; no burrs.Features a 4"L tongue to slide under books for support; 1 1/2"L back base provides stability. Rubberized composition cork base prevents slipping and keeps books upright, relieving the strain on book spines. Available in 10 scratch-resistant, non-fade powder paint colors: -01 black, -02 blue, -08 desert sand, -09 grey, -10 green, -12 jade green, -18 red, -25 yellow, -48 putty, -53 burgundy. Overall dimensions: 5 1/2H x 4 3/4W x 5 1/2"D