This kit includes Spool holder handle, and three spools. The handle features a bed marker to help center the grid on a 30" bed. Spools are gridded to mark 2, 3, or 4 row spacing. 2 rows on a 30" bed (30/2=13"); rows are 15" apart. 3 rows on a 30" bed (30/3=10"); rows are spaced 10" apart. 4 rows on a 30" bed (30/4=7.5"); rows are 7.5" apart. Dibble spikes can be included as well.