Device for adjustable fixing of an accessory on a board for gliding comprising a base, comprising locations for fixing the accessory and receiving a bar having a toothed part capable of a positioning in a complementary toothed part integral with the board for gliding, wherein the bar is mounted so as to be movable in rotation on the base about an axis, comprises, on either side of this axis, the toothed part and an end, and which comprises a knob capable of occupying two different positions, comprising a cam surface that interacts with the end of the bar such that a first position of the knob corresponds to a low position of the toothed part and a second position corresponds to a high position of the toothed part.