Sand Cone Density Plate, 12″ x 12″ (305mmx305mm) Aluminum alloy with ½” (12.7mm) high edge walls to contain soil sample that is dug using 6½” (165mm) center hole of plate as a guide.  After test hole is prepared, glange of cone fits plate opening for filling hole with special Density Sand. Use with Sand Cone Density Kit HM100, 1 gallon (3.8L) threaded plastic jar with detachable brass double cone fitting.