MEASUREMENTS TAKEN WITH RADIANT LYING FLAT: 7-1/2" long x 3-7/16" wide; 15/16" high (including surrounding ridge, with is 5/8" high). Holes are 5/16" diameter; shorter slots are 1-3/8" long x 5/16" wide; longer (center) slots are 2-1/4" long x 5-1/6" wide. Spikes are 1/2" long. Other identification on package includes "1091000 outer."