An excavator mounted hydraulically driven forestry mulching head is required for a 14 tonne excavator by the OPW. The Contractor shall supply the quantity actually ordered during the currency of this contract to meet the requirements of the OPW at the prices stated in their tender, whether they be more or less in any degree than the quantity stated in the schedule. Minor variances to the specifications may be taken into account and considered at the competition assessment stage. This shall be solely at the discretion of the OPW.