Gilder Finder Grids G400F1. Nickel grids, 400 mesh. The block of 1152 (32x36) individual cells is divided into smaller blocks bounded by thicker crenellated bars. Each small block of 36 (6x6) cells has a central number from 1 to 32 for identification
Gilder Finder Grids G300F1. Nickel grids, 300 mesh. The block of 625 (25x25) individual cells is divided into smaller blocks bounded by thicker crenellated bars. Each small block of 25 cells has a central alphabet letter from A to Y for identificatio