so that the casters are installed more tightly and can withstand greater force

DIMENSIONS: 23 1/2"(L) X 5 1/4"(W) X 3 3/10" (H)

Heat plate Dimensions: 15" X 4 3/8"

NOTE：If your fire pit is used on a lawn or deck

Cooking Grid Grates for Kenmore 4 Burner 141.1768, 141.176801, 141.17680, 141.17681, 640-05057345-0, 141.16681, 141.155400, 151.157951 Gas Grills Backyard Grate so that the casters areGrill Grate for Kenmore 141. 1768, 1768, 141. 176801, 176801, 141. 17680, 17681, 17691, 141. 17681, 17690, 640 05057345 0, 141. 16681, 16681, 141. 155400, 155400, 151. 157951, 157951 4 Burner Gas Grills. Dimensions: 16 1 2" x 10 9 10" each cooking grate, 16 1 2" X 21 8 10" total 2 grates; 41. 91cm x 27. 69cm each cooking grate, 41. 91cm X 55. 37cm total 2 grates. Material: Non magnetic Heavy Duty Cast Iron , Best Quality and Long Life ! Don't know