The size of a drove refers to the length of its cutting edge. Droves are available in the same lengths as the scutch comb holders on a scutch chisel or scutch hammer. For example, a 13mm (½”) drove will fit into the groove of the scutch comb holder on a 13mm (½”) scutch chisel.
Droves are avaliable in sizes 13-50mm (½ – 2″).
The most common size of drove is 25mm (1″) as it can fit both a scutch chisel and a scutch hammer. This is because scutch hammers can only fit a 25mm (1″) drove.