Product Details Literature Cal-Trans 1 1/2 in Straight Grooves Product ID: HR-100 Product Details Smooth 1/4” grooves spaced 1 1/2” apart. HR-100 Cal-Trans 1.5” Straight Grooves – 24.125” x 47.875” (61.27 x 121.6 cm) HR-400 Cal-Trans 0.75” Straight Grooves – 12.25” x 48.25” (31.12 x 122.56 cm) Literature Product Literature Catalog2018 Brickform Catalog (18.6MB) Color Cards