Designed for bending and forming without marring the article being worked. Lighter in weight and less expensive than comparable steel blocks. Includes 5 wood rollers in the diameters 1.3", 1.43", 1.66", 2.33", and 2.78" (32.8, 36.3, 42.1, 59.1, and 70.7 mm). Wood block has 5 corresponding half-round grooves, all slightly larger in diameter. Block is 7" long x 1-3/4" wide x 2-3/8" high.